21622598540 has 96 divisors (see below), whose sum is σ = 48170021760. Its totient is φ = 8136032256.

The previous prime is 21622598533. The next prime is 21622598581. The reversal of 21622598540 is 4589522612.

It is a junction number, because it is equal to n+sod(n) for n = 21622598491 and 21622598500.

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, 15345356 + ... + 15346764.

It is an arithmetic number, because the mean of its divisors is an integer number (501771060).

Almost surely, 2^21622598540 is an apocalyptic number.

21622598540 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 21622598540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24085010880).

21622598540 is an abundant number, since it is smaller than the sum of its proper divisors (26547423220).

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

21622598540 is a wasteful number, since it uses less digits than its factorization.

21622598540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971 (or 1969 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 21622598540 in words is "twenty-one billion, six hundred twenty-two million, five hundred ninety-eight thousand, five hundred forty".