21514702551 has 16 divisors (see below), whose sum is σ = 28856592000. Its totient is φ = 14258030688.

The previous prime is 21514702549. The next prime is 21514702571. The reversal of 21514702551 is 15520741512.

It is not a de Polignac number, because 21514702551 - 2¹ = 21514702549 is a prime.

It is a super-3 number, since 3×21514702551³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514702541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2157525 + ... + 2167473.

It is an arithmetic number, because the mean of its divisors is an integer number (1803537000).

Almost surely, 2^21514702551 is an apocalyptic number.

21514702551 is a deficient number, since it is larger than the sum of its proper divisors (7341889449).

21514702551 is a wasteful number, since it uses less digits than its factorization.

21514702551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14158.

The product of its (nonzero) digits is 14000, while the sum is 33.

The spelling of 21514702551 in words is "twenty-one billion, five hundred fourteen million, seven hundred two thousand, five hundred fifty-one".