1011021421 has 4 divisors (see below), whose sum is σ = 1014619644. Its totient is φ = 1007423200.

The previous prime is 1011021409. The next prime is 1011021443. The reversal of 1011021421 is 1241201101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1241201101 = 7 ⋅177314443.

It can be written as a sum of positive squares in 2 ways, for example, as 790172100 + 220849321 = 28110^2 + 14861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011021421 - 2¹³ = 1011013229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011021821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1798690 + ... + 1799251.

It is an arithmetic number, because the mean of its divisors is an integer number (253654911).

Almost surely, 2^1011021421 is an apocalyptic number.

It is an amenable number.

1011021421 is a deficient number, since it is larger than the sum of its proper divisors (3598223).

1011021421 is an equidigital number, since it uses as much as digits as its factorization.

1011021421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3598222.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1011021421 is about 31796.5630375360. The cubic root of 1011021421 is about 1003.6603921812.

Adding to 1011021421 its reverse (1241201101), we get a palindrome (2252222522).

The spelling of 1011021421 in words is "one billion, eleven million, twenty-one thousand, four hundred twenty-one".