102111012021423 has 4 divisors (see below), whose sum is σ = 136148016028568. Its totient is φ = 68074008014280.

The previous prime is 102111012021313. The next prime is 102111012021481. The reversal of 102111012021423 is 324120210111201.

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

It is not a de Polignac number, because 102111012021423 - 2⁸ = 102111012021167 is a prime.

It is a super-2 number, since 2×102111012021423² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102111012021423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102111012021523) 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, 17018502003568 + ... + 17018502003573.

It is an arithmetic number, because the mean of its divisors is an integer number (34037004007142).

Almost surely, 2^{102111012021423} is an apocalyptic number.

102111012021423 is a deficient number, since it is larger than the sum of its proper divisors (34037004007145).

102111012021423 is an equidigital number, since it uses as much as digits as its factorization.

102111012021423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34037004007144.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 102111012021423 its reverse (324120210111201), we get a palindrome (426231222132624).

The spelling of 102111012021423 in words is "one hundred two trillion, one hundred eleven billion, twelve million, twenty-one thousand, four hundred twenty-three".