21405222700 has 18 divisors (see below), whose sum is σ = 46449333476. Its totient is φ = 8562089040.

The previous prime is 21405222697. The next prime is 21405222743. The reversal of 21405222700 is 722250412.

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 5 ways as a sum of consecutive naturals, for example, 107026014 + ... + 107026213.

Almost surely, 2^21405222700 is an apocalyptic number.

21405222700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21405222700 is an abundant number, since it is smaller than the sum of its proper divisors (25044110776).

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

21405222700 is a wasteful number, since it uses less digits than its factorization.

21405222700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214052241 (or 214052234 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The spelling of 21405222700 in words is "twenty-one billion, four hundred five million, two hundred twenty-two thousand, seven hundred".