21626457340 has 24 divisors (see below), whose sum is σ = 45865223712. Its totient is φ = 8564932800.

The previous prime is 21626457323. The next prime is 21626457373. The reversal of 21626457340 is 4375462612.

It is a junction number, because it is equal to n+sod(n) for n = 21626457293 and 21626457302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5351064 + ... + 5355103.

It is an arithmetic number, because the mean of its divisors is an integer number (1911050988).

Almost surely, 2^21626457340 is an apocalyptic number.

21626457340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21626457340 is an abundant number, since it is smaller than the sum of its proper divisors (24238766372).

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

21626457340 is a wasteful number, since it uses less digits than its factorization.

21626457340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10706277 (or 10706275 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 21626457340 in words is "twenty-one billion, six hundred twenty-six million, four hundred fifty-seven thousand, three hundred forty".