102021311231 has 4 divisors (see below), whose sum is σ = 116595784272. Its totient is φ = 87446838192.

The previous prime is 102021311177. The next prime is 102021311303. The reversal of 102021311231 is 132113120201.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-102021311231 is a prime.

It is a super-2 number, since 2×102021311231² (a number of 23 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 (102021311131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7287236510 + ... + 7287236523.

It is an arithmetic number, because the mean of its divisors is an integer number (29148946068).

Almost surely, 2^102021311231 is an apocalyptic number.

102021311231 is a deficient number, since it is larger than the sum of its proper divisors (14574473041).

102021311231 is an equidigital number, since it uses as much as digits as its factorization.

102021311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14574473040.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 102021311231 its reverse (132113120201), we get a palindrome (234134431432).

The spelling of 102021311231 in words is "one hundred two billion, twenty-one million, three hundred eleven thousand, two hundred thirty-one".