21340747340 has 48 divisors (see below), whose sum is σ = 51015363840. Its totient is φ = 7422866880.

The previous prime is 21340747319. The next prime is 21340747369. The reversal of 21340747340 is 4374704312.

It is a self number, because there is not a number n which added to its sum of digits gives 21340747340.

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, 2103710 + ... + 2113829.

It is an arithmetic number, because the mean of its divisors is an integer number (1062820080).

Almost surely, 2^21340747340 is an apocalyptic number.

21340747340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21340747340 is an abundant number, since it is smaller than the sum of its proper divisors (29674616500).

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

21340747340 is a wasteful number, since it uses less digits than its factorization.

21340747340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4217582 (or 4217580 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 35.

The spelling of 21340747340 in words is "twenty-one billion, three hundred forty million, seven hundred forty-seven thousand, three hundred forty".