21673424420 has 24 divisors (see below), whose sum is σ = 45574827648. Its totient is φ = 8657820000.

The previous prime is 21673424401. The next prime is 21673424441. The reversal of 21673424420 is 2442437612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706466 + ... + 736505.

It is an arithmetic number, because the mean of its divisors is an integer number (1898951152).

Almost surely, 2^21673424420 is an apocalyptic number.

21673424420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21673424420 is an abundant number, since it is smaller than the sum of its proper divisors (23901403228).

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

21673424420 is a wasteful number, since it uses less digits than its factorization.

21673424420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443731 (or 1443729 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

The spelling of 21673424420 in words is "twenty-one billion, six hundred seventy-three million, four hundred twenty-four thousand, four hundred twenty".