102123030021 has 24 divisors (see below), whose sum is σ = 140891447520. Its totient is φ = 65795297760.

The previous prime is 102123029989. The next prime is 102123030157. The reversal of 102123030021 is 120030321201.

It is not a de Polignac number, because 102123030021 - 2⁵ = 102123029989 is a prime.

It is a super-2 number, since 2×102123030021² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102123030421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2106571 + ... + 2154503.

It is an arithmetic number, because the mean of its divisors is an integer number (5870476980).

Almost surely, 2^102123030021 is an apocalyptic number.

It is an amenable number.

102123030021 is a deficient number, since it is larger than the sum of its proper divisors (38768417499).

102123030021 is an equidigital number, since it uses as much as digits as its factorization.

102123030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48737 (or 48706 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 102123030021 its reverse (120030321201), we get a palindrome (222153351222).

The spelling of 102123030021 in words is "one hundred two billion, one hundred twenty-three million, thirty thousand, twenty-one".