1021321231 has 16 divisors (see below), whose sum is σ = 1248808960. Its totient is φ = 815741280.

The previous prime is 1021321219. The next prime is 1021321237. The reversal of 1021321231 is 1321231201.

It is a cyclic number.

It is not a de Polignac number, because 1021321231 - 2²³ = 1012932623 is a prime.

It is a super-2 number, since 2×1021321231² = 2086194113782710722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021321237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54831 + ... + 71056.

It is an arithmetic number, because the mean of its divisors is an integer number (78050560).

Almost surely, 2^1021321231 is an apocalyptic number.

1021321231 is a deficient number, since it is larger than the sum of its proper divisors (227487729).

1021321231 is a wasteful number, since it uses less digits than its factorization.

1021321231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125974.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1021321231 is about 31958.1168249946. The cubic root of 1021321231 is about 1007.0571563868.

Adding to 1021321231 its reverse (1321231201), we get a palindrome (2342552432).

The spelling of 1021321231 in words is "one billion, twenty-one million, three hundred twenty-one thousand, two hundred thirty-one".