102012022100021 has 4 divisors (see below), whose sum is σ = 111285842290944. Its totient is φ = 92738201909100.

The previous prime is 102012022100017. The next prime is 102012022100029. The reversal of 102012022100021 is 120001220210201.

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 not a de Polignac number, because 102012022100021 - 2² = 102012022100017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102012022099969 and 102012022100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102012022100029) 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, 4636910095445 + ... + 4636910095466.

It is an arithmetic number, because the mean of its divisors is an integer number (27821460572736).

Almost surely, 2^{102012022100021} is an apocalyptic number.

102012022100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102012022100021 is a deficient number, since it is larger than the sum of its proper divisors (9273820190923).

102012022100021 is an equidigital number, since it uses as much as digits as its factorization.

102012022100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9273820190922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 102012022100021 its reverse (120001220210201), we get a palindrome (222013242310222).

The spelling of 102012022100021 in words is "one hundred two trillion, twelve billion, twenty-two million, one hundred thousand, twenty-one".