21477314177251 has 16 divisors (see below), whose sum is σ = 21934630008864. Its totient is φ = 21021986329344.

The previous prime is 21477314177219. The next prime is 21477314177287. The reversal of 21477314177251 is 15277141377412.

It is a cyclic number.

It is not a de Polignac number, because 21477314177251 - 2⁵ = 21477314177219 is a prime.

It is a super-2 number, since 2×21477314177251² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21477314177651) 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, 37711951 + ... + 38277223.

It is an arithmetic number, because the mean of its divisors is an integer number (1370914375554).

Almost surely, 2^{21477314177251} is an apocalyptic number.

21477314177251 is a deficient number, since it is larger than the sum of its proper divisors (457315831613).

21477314177251 is an equidigital number, since it uses as much as digits as its factorization.

21477314177251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567030.

The product of its digits is 2304960, while the sum is 52.

The spelling of 21477314177251 in words is "twenty-one trillion, four hundred seventy-seven billion, three hundred fourteen million, one hundred seventy-seven thousand, two hundred fifty-one".