31020021230021 has 4 divisors (see below), whose sum is σ = 31256815285344. Its totient is φ = 30783227174700.

The previous prime is 31020021229997. The next prime is 31020021230039. The reversal of 31020021230021 is 12003212002013.

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.

It is a cyclic number.

It is not a de Polignac number, because 31020021230021 - 2³⁰ = 31018947488197 is a prime.

It is a super-2 number, since 2×31020021230021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020021232021) 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, 118397027465 + ... + 118397027726.

It is an arithmetic number, because the mean of its divisors is an integer number (7814203821336).

Almost surely, 2^{31020021230021} is an apocalyptic number.

It is an amenable number.

31020021230021 is a deficient number, since it is larger than the sum of its proper divisors (236794055323).

31020021230021 is a wasteful number, since it uses less digits than its factorization.

31020021230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236794055322.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31020021230021 its reverse (12003212002013), we get a palindrome (43023233232034).

The spelling of 31020021230021 in words is "thirty-one trillion, twenty billion, twenty-one million, two hundred thirty thousand, twenty-one".