21723651412202 has 4 divisors (see below), whose sum is σ = 32585477118306. Its totient is φ = 10861825706100.

The previous prime is 21723651412201. The next prime is 21723651412231. The reversal of 21723651412202 is 20221415632712.

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., 14394291828361 + 7329359583841 = 3793981^2 + 2707279^2 .

It is not an unprimeable number, because it can be changed into a prime (21723651412201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5430912853049 + ... + 5430912853052.

Almost surely, 2^{21723651412202} is an apocalyptic number.

21723651412202 is a deficient number, since it is larger than the sum of its proper divisors (10861825706104).

21723651412202 is a wasteful number, since it uses less digits than its factorization.

21723651412202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10861825706103.

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 21723651412202 in words is "twenty-one trillion, seven hundred twenty-three billion, six hundred fifty-one million, four hundred twelve thousand, two hundred two".