21054635400 has 96 divisors (see below), whose sum is σ = 67033477440. Its totient is φ = 5462818560.

The previous prime is 21054635389. The next prime is 21054635401. The reversal of 21054635400 is 453645012.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21054635401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 452004 + ... + 496403.

It is an arithmetic number, because the mean of its divisors is an integer number (698265390).

Almost surely, 2^21054635400 is an apocalyptic number.

21054635400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21054635400 is an abundant number, since it is smaller than the sum of its proper divisors (45978842040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21054635400 is a wasteful number, since it uses less digits than its factorization.

21054635400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948463 (or 948454 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21054635400 in words is "twenty-one billion, fifty-four million, six hundred thirty-five thousand, four hundred".