21444034620 has 48 divisors (see below), whose sum is σ = 60063389568. Its totient is φ = 5716495680.

The previous prime is 21444034559. The next prime is 21444034639. The reversal of 21444034620 is 2643044412.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125755 + ... + 242285.

It is an arithmetic number, because the mean of its divisors is an integer number (1251320616).

Almost surely, 2^21444034620 is an apocalyptic number.

21444034620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444034620 is an abundant number, since it is smaller than the sum of its proper divisors (38619354948).

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

21444034620 is a wasteful number, since it uses less digits than its factorization.

21444034620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119610 (or 119608 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The spelling of 21444034620 in words is "twenty-one billion, four hundred forty-four million, thirty-four thousand, six hundred twenty".