21439032651 has 12 divisors (see below), whose sum is σ = 30970139512. Its totient is φ = 14291466336.

The previous prime is 21439032631. The next prime is 21439032653. The reversal of 21439032651 is 15623093412.

21439032651 is a `hidden beast` number, since 2 + 1 + 4 + 390 + 3 + 265 + 1 = 666.

It is not a de Polignac number, because 21439032651 - 2¹³ = 21439024459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21439032653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16500 + ... + 207726.

Almost surely, 2^21439032651 is an apocalyptic number.

21439032651 is a deficient number, since it is larger than the sum of its proper divisors (9531106861).

21439032651 is a wasteful number, since it uses less digits than its factorization.

21439032651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203690 (or 203687 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 21439032651 in words is "twenty-one billion, four hundred thirty-nine million, thirty-two thousand, six hundred fifty-one".