1211301421 has 4 divisors (see below), whose sum is σ = 1321419744. Its totient is φ = 1101183100.

The previous prime is 1211301407. The next prime is 1211301431. The reversal of 1211301421 is 1241031121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1241031121 = 11 ⋅112821011.

It is a cyclic number.

It is not a de Polignac number, because 1211301421 - 2¹¹ = 1211299373 is a prime.

It is a super-2 number, since 2×1211301421² = 2934502265033238482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211301395 and 1211301404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211301401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55059145 + ... + 55059166.

It is an arithmetic number, because the mean of its divisors is an integer number (330354936).

Almost surely, 2^1211301421 is an apocalyptic number.

1211301421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211301421 is a deficient number, since it is larger than the sum of its proper divisors (110118323).

1211301421 is a wasteful number, since it uses less digits than its factorization.

1211301421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110118322.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1211301421 is about 34803.7558461727. The cubic root of 1211301421 is about 1065.9841376574.

Adding to 1211301421 its reverse (1241031121), we get a palindrome (2452332542).

The spelling of 1211301421 in words is "one billion, two hundred eleven million, three hundred one thousand, four hundred twenty-one".