21623848551 has 12 divisors (see below), whose sum is σ = 31238257128. Its totient is φ = 14414140944.

The previous prime is 21623848549. The next prime is 21623848553. The reversal of 21623848551 is 15584832612.

21623848551 is a `hidden beast` number, since 2 + 1 + 62 + 38 + 4 + 8 + 551 = 666.

It is an interprime number because it is at equal distance from previous prime (21623848549) and next prime (21623848553).

It is not a de Polignac number, because 21623848551 - 2¹ = 21623848549 is a prime.

It is a super-3 number, since 3×21623848551³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21623848497 and 21623848506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21623848553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66300 + ... + 218273.

It is an arithmetic number, because the mean of its divisors is an integer number (2603188094).

Almost surely, 2^21623848551 is an apocalyptic number.

21623848551 is a deficient number, since it is larger than the sum of its proper divisors (9614408577).

21623848551 is a wasteful number, since it uses less digits than its factorization.

21623848551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293022 (or 293019 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The spelling of 21623848551 in words is "twenty-one billion, six hundred twenty-three million, eight hundred forty-eight thousand, five hundred fifty-one".