21738747900 has 72 divisors (see below), whose sum is σ = 63454157424. Its totient is φ = 5745689600.

The previous prime is 21738747893. The next prime is 21738747907. The reversal of 21738747900 is 974783712.

It is an interprime number because it is at equal distance from previous prime (21738747893) and next prime (21738747907).

It is a self number, because there is not a number n which added to its sum of digits gives 21738747900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21738747907) 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, 286731 + ... + 354530.

It is an arithmetic number, because the mean of its divisors is an integer number (881307742).

Almost surely, 2^21738747900 is an apocalyptic number.

21738747900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21738747900 is an abundant number, since it is smaller than the sum of its proper divisors (41715409524).

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

21738747900 is a wasteful number, since it uses less digits than its factorization.

21738747900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641391 (or 641384 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 48.

The spelling of 21738747900 in words is "twenty-one billion, seven hundred thirty-eight million, seven hundred forty-seven thousand, nine hundred".