21334511551 has 8 divisors (see below), whose sum is σ = 22825535600. Its totient is φ = 19880303040.

The previous prime is 21334511543. The next prime is 21334511563. The reversal of 21334511551 is 15511543312.

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

It is a cyclic number.

It is not a de Polignac number, because 21334511551 - 2³ = 21334511543 is a prime.

It is a super-2 number, since 2×21334511551² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334511501) 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, 9202686 + ... + 9205003.

It is an arithmetic number, because the mean of its divisors is an integer number (2853191950).

Almost surely, 2^21334511551 is an apocalyptic number.

21334511551 is a deficient number, since it is larger than the sum of its proper divisors (1491024049).

21334511551 is a wasteful number, since it uses less digits than its factorization.

21334511551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18407769.

The product of its digits is 9000, while the sum is 31.

The spelling of 21334511551 in words is "twenty-one billion, three hundred thirty-four million, five hundred eleven thousand, five hundred fifty-one".