21244152051 has 12 divisors (see below), whose sum is σ = 32491056312. Its totient is φ = 13329663936.

The previous prime is 21244152031. The next prime is 21244152077. The reversal of 21244152051 is 15025144212.

It is a happy number.

21244152051 is a `hidden beast` number, since 2 + 12 + 441 + 5 + 205 + 1 = 666.

It is not a de Polignac number, because 21244152051 - 2¹⁴ = 21244135667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21244152001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69425181 + ... + 69425486.

It is an arithmetic number, because the mean of its divisors is an integer number (2707588026).

Almost surely, 2^21244152051 is an apocalyptic number.

21244152051 is a deficient number, since it is larger than the sum of its proper divisors (11246904261).

21244152051 is a wasteful number, since it uses less digits than its factorization.

21244152051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138850690 (or 138850687 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 21244152051 its reverse (15025144212), we get a palindrome (36269296263).

The spelling of 21244152051 in words is "twenty-one billion, two hundred forty-four million, one hundred fifty-two thousand, fifty-one".