21123023202 has 24 divisors (see below), whose sum is σ = 45771111984. Its totient is φ = 7040305944.

The previous prime is 21123023191. The next prime is 21123023213. The reversal of 21123023202 is 20232032112.

21123023202 is a `hidden beast` number, since 211 + 230 + 23 + 202 = 666.

It is an interprime number because it is at equal distance from previous prime (21123023191) and next prime (21123023213).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146553 + ... + 252435.

It is an arithmetic number, because the mean of its divisors is an integer number (1907129666).

Almost surely, 2^21123023202 is an apocalyptic number.

21123023202 is an abundant number, since it is smaller than the sum of its proper divisors (24648088782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123023202 is a wasteful number, since it uses less digits than its factorization.

21123023202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116974 (or 116971 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21123023202 its reverse (20232032112), we get a palindrome (41355055314).

It can be divided in two parts, 211230 and 23202, that added together give a palindrome (234432).

The spelling of 21123023202 in words is "twenty-one billion, one hundred twenty-three million, twenty-three thousand, two hundred two".