21114552551 has 8 divisors (see below), whose sum is σ = 23127502320. Its totient is φ = 19187260288.

The previous prime is 21114552539. The next prime is 21114552623. The reversal of 21114552551 is 15525541112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21114552551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114551551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21413861 + ... + 21414846.

It is an arithmetic number, because the mean of its divisors is an integer number (2890937790).

Almost surely, 2^21114552551 is an apocalyptic number.

21114552551 is a deficient number, since it is larger than the sum of its proper divisors (2012949769).

21114552551 is a wasteful number, since it uses less digits than its factorization.

21114552551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42828753.

The product of its digits is 10000, while the sum is 32.

The spelling of 21114552551 in words is "twenty-one billion, one hundred fourteen million, five hundred fifty-two thousand, five hundred fifty-one".