21424474780 has 24 divisors (see below), whose sum is σ = 45002810160. Its totient is φ = 8567616000.

The previous prime is 21424474639. The next prime is 21424474787. The reversal of 21424474780 is 8747442412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424474787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53850 + ... + 213889.

It is an arithmetic number, because the mean of its divisors is an integer number (1875117090).

Almost surely, 2^21424474780 is an apocalyptic number.

21424474780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21424474780 is an abundant number, since it is smaller than the sum of its proper divisors (23578335380).

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

21424474780 is a wasteful number, since it uses less digits than its factorization.

21424474780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271749 (or 271747 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 43.

The spelling of 21424474780 in words is "twenty-one billion, four hundred twenty-four million, four hundred seventy-four thousand, seven hundred eighty".