21225351400 has 48 divisors (see below), whose sum is σ = 53835215040. Its totient is φ = 7718308800.

The previous prime is 21225351359. The next prime is 21225351443. The reversal of 21225351400 is 415352212.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4821744 + ... + 4826143.

It is an arithmetic number, because the mean of its divisors is an integer number (1121566980).

Almost surely, 2^21225351400 is an apocalyptic number.

21225351400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21225351400 is an abundant number, since it is smaller than the sum of its proper divisors (32609863640).

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

21225351400 is a wasteful number, since it uses less digits than its factorization.

21225351400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9647914 (or 9647905 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 21225351400 in words is "twenty-one billion, two hundred twenty-five million, three hundred fifty-one thousand, four hundred".