21054700051 has 8 divisors (see below), whose sum is σ = 26250015744. Its totient is φ = 16406259720.

The previous prime is 21054700021. The next prime is 21054700061. The reversal of 21054700051 is 15000745012.

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 21054700051 - 2³³ = 12464765459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21054699989 and 21054700025.

It is not an unprimeable number, because it can be changed into a prime (21054700021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136718755 + ... + 136718908.

It is an arithmetic number, because the mean of its divisors is an integer number (3281251968).

Almost surely, 2^21054700051 is an apocalyptic number.

21054700051 is a deficient number, since it is larger than the sum of its proper divisors (5195315693).

21054700051 is a wasteful number, since it uses less digits than its factorization.

21054700051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273437681.

The product of its (nonzero) digits is 1400, while the sum is 25.

The spelling of 21054700051 in words is "twenty-one billion, fifty-four million, seven hundred thousand, fifty-one".