21152362165226 has 4 divisors (see below), whose sum is σ = 31728543247842. Its totient is φ = 10576181082612.

The previous prime is 21152362165223. The next prime is 21152362165241. The reversal of 21152362165226 is 62256126325112.

It is a happy number.

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., 16446261049201 + 4706101116025 = 4055399^2 + 2169355^2 .

It is not an unprimeable number, because it can be changed into a prime (21152362165223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5288090541305 + ... + 5288090541308.

Almost surely, 2^{21152362165226} is an apocalyptic number.

21152362165226 is a deficient number, since it is larger than the sum of its proper divisors (10576181082616).

21152362165226 is a wasteful number, since it uses less digits than its factorization.

21152362165226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10576181082615.

The product of its digits is 518400, while the sum is 44.

The spelling of 21152362165226 in words is "twenty-one trillion, one hundred fifty-two billion, three hundred sixty-two million, one hundred sixty-five thousand, two hundred twenty-six".