21590990320 has 160 divisors (see below), whose sum is σ = 52404770880. Its totient is φ = 8266752000.

The previous prime is 21590990299. The next prime is 21590990339. The reversal of 21590990320 is 2309909512.

It is a super-4 number, since 4×21590990320⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 46834890 + ... + 46835350.

It is an arithmetic number, because the mean of its divisors is an integer number (327529818).

Almost surely, 2^21590990320 is an apocalyptic number.

21590990320 is a gapful number since it is divisible by the number (20) 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 21590990320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26202385440).

21590990320 is an abundant number, since it is smaller than the sum of its proper divisors (30813780560).

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

21590990320 is a wasteful number, since it uses less digits than its factorization.

21590990320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 749 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 40.

The spelling of 21590990320 in words is "twenty-one billion, five hundred ninety million, nine hundred ninety thousand, three hundred twenty".