21437770224 has 160 divisors (see below), whose sum is σ = 64945843200. Its totient is φ = 6033484800.

The previous prime is 21437770201. The next prime is 21437770259. The reversal of 21437770224 is 42207773412.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 312649 + ... + 374999.

It is an arithmetic number, because the mean of its divisors is an integer number (405911520).

Almost surely, 2^21437770224 is an apocalyptic number.

21437770224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21437770224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32472921600).

21437770224 is an abundant number, since it is smaller than the sum of its proper divisors (43508072976).

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

21437770224 is a wasteful number, since it uses less digits than its factorization.

21437770224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62423 (or 62417 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 39.

The spelling of 21437770224 in words is "twenty-one billion, four hundred thirty-seven million, seven hundred seventy thousand, two hundred twenty-four".