21054006315047 has 4 divisors (see below), whose sum is σ = 21054015901536. Its totient is φ = 21053996728560.

The previous prime is 21054006314993. The next prime is 21054006315059. The reversal of 21054006315047 is 74051360045012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21054006315047 - 2²² = 21054002120743 is a prime.

It is a super-2 number, since 2×21054006315047² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21054006315047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054006315647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317522 + ... + 6496832.

It is an arithmetic number, because the mean of its divisors is an integer number (5263503975384).

Almost surely, 2^{21054006315047} is an apocalyptic number.

21054006315047 is a deficient number, since it is larger than the sum of its proper divisors (9586489).

21054006315047 is an equidigital number, since it uses as much as digits as its factorization.

21054006315047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9586488.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 21054006315047 in words is "twenty-one trillion, fifty-four billion, six million, three hundred fifteen thousand, forty-seven".