102012312021 has 4 divisors (see below), whose sum is σ = 136016416032. Its totient is φ = 68008208012.

The previous prime is 102012312019. The next prime is 102012312049. The reversal of 102012312021 is 120213210201.

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 102012312021 - 2¹ = 102012312019 is a prime.

It is a super-2 number, since 2×102012312021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102012312221) 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, 17002052001 + ... + 17002052006.

It is an arithmetic number, because the mean of its divisors is an integer number (34004104008).

Almost surely, 2^102012312021 is an apocalyptic number.

It is an amenable number.

102012312021 is a deficient number, since it is larger than the sum of its proper divisors (34004104011).

102012312021 is an equidigital number, since it uses as much as digits as its factorization.

102012312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34004104010.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 102012312021 its reverse (120213210201), we get a palindrome (222225522222).

The spelling of 102012312021 in words is "one hundred two billion, twelve million, three hundred twelve thousand, twenty-one".