21123030310202 has 4 divisors (see below), whose sum is σ = 31684545465306. Its totient is φ = 10561515155100.

The previous prime is 21123030310199. The next prime is 21123030310229. The reversal of 21123030310202 is 20201303032112.

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

It can be written as a sum of positive squares in only one way, i.e., 16360819612201 + 4762210698001 = 4044851^2 + 2182249^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280757577549 + ... + 5280757577552.

Almost surely, 2^{21123030310202} is an apocalyptic number.

21123030310202 is a deficient number, since it is larger than the sum of its proper divisors (10561515155104).

21123030310202 is a wasteful number, since it uses less digits than its factorization.

21123030310202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561515155103.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21123030310202 its reverse (20201303032112), we get a palindrome (41324333342314).

The spelling of 21123030310202 in words is "twenty-one trillion, one hundred twenty-three billion, thirty million, three hundred ten thousand, two hundred two".