102021012731 has 8 divisors (see below), whose sum is σ = 117842453424. Its totient is φ = 87290705920.

The previous prime is 102021012727. The next prime is 102021012733. The reversal of 102021012731 is 137210120201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 102021012731 - 2² = 102021012727 is a prime.

It is a super-2 number, since 2×102021012731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102021012733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272783270 + ... + 272783643.

It is an arithmetic number, because the mean of its divisors is an integer number (14730306678).

Almost surely, 2^102021012731 is an apocalyptic number.

102021012731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

102021012731 is a deficient number, since it is larger than the sum of its proper divisors (15821440693).

102021012731 is a wasteful number, since it uses less digits than its factorization.

102021012731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545566941.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 102021012731 its reverse (137210120201), we get a palindrome (239231132932).

The spelling of 102021012731 in words is "one hundred two billion, twenty-one million, twelve thousand, seven hundred thirty-one".