21451924277 has 12 divisors (see below), whose sum is σ = 25254938016. Its totient is φ = 18165825720.

The previous prime is 21451924271. The next prime is 21451924279. The reversal of 21451924277 is 77242915412.

It is not a de Polignac number, because 21451924277 - 2¹² = 21451920181 is a prime.

It is a super-2 number, since 2×21451924277² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451924271) 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 11 ways as a sum of consecutive naturals, for example, 2633249 + ... + 2641382.

It is an arithmetic number, because the mean of its divisors is an integer number (2104578168).

Almost surely, 2^21451924277 is an apocalyptic number.

It is an amenable number.

21451924277 is a deficient number, since it is larger than the sum of its proper divisors (3803013739).

21451924277 is an equidigital number, since it uses as much as digits as its factorization.

21451924277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5274728 (or 5274721 counting only the distinct ones).

The product of its digits is 282240, while the sum is 44.

The spelling of 21451924277 in words is "twenty-one billion, four hundred fifty-one million, nine hundred twenty-four thousand, two hundred seventy-seven".