1211312421 has 32 divisors (see below), whose sum is σ = 1990886400. Its totient is φ = 721675440.

The previous prime is 1211312419. The next prime is 1211312437. The reversal of 1211312421 is 1242131121.

1211312421 is a `hidden beast` number, since 1 + 211 + 31 + 2 + 421 = 666.

It is not a de Polignac number, because 1211312421 - 2¹ = 1211312419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211312394 and 1211312403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211312461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17041 + ... + 52086.

It is an arithmetic number, because the mean of its divisors is an integer number (62215200).

Almost surely, 2^1211312421 is an apocalyptic number.

1211312421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211312421 is a deficient number, since it is larger than the sum of its proper divisors (779573979).

1211312421 is a wasteful number, since it uses less digits than its factorization.

1211312421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69206 (or 69200 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1211312421 is about 34803.9138747354. The cubic root of 1211312421 is about 1065.9873644320.

Adding to 1211312421 its reverse (1242131121), we get a palindrome (2453443542).

The spelling of 1211312421 in words is "one billion, two hundred eleven million, three hundred twelve thousand, four hundred twenty-one".