21400553511 has 32 divisors (see below), whose sum is σ = 32331156480. Its totient is φ = 13987807488.

The previous prime is 21400553501. The next prime is 21400553539. The reversal of 21400553511 is 11535500412.

21400553511 is a `hidden beast` number, since 2 + 140 + 0 + 5 + 5 + 3 + 511 = 666.

It is not a de Polignac number, because 21400553511 - 2¹⁰ = 21400552487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400553501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242050 + ... + 318416.

It is an arithmetic number, because the mean of its divisors is an integer number (1010348640).

Almost surely, 2^21400553511 is an apocalyptic number.

21400553511 is a deficient number, since it is larger than the sum of its proper divisors (10930602969).

21400553511 is a wasteful number, since it uses less digits than its factorization.

21400553511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76580 (or 76574 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 21400553511 in words is "twenty-one billion, four hundred million, five hundred fifty-three thousand, five hundred eleven".