21616240340 has 24 divisors (see below), whose sum is σ = 47783268960. Its totient is φ = 8191417248.

The previous prime is 21616240339. The next prime is 21616240361. The reversal of 21616240340 is 4304261612.

It is a super-3 number, since 3×21616240340³ (a number of 32 digits) contains 333 as substring.

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, 28442042 + ... + 28442801.

It is an arithmetic number, because the mean of its divisors is an integer number (1990969540).

Almost surely, 2^21616240340 is an apocalyptic number.

21616240340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21616240340 is an abundant number, since it is smaller than the sum of its proper divisors (26167028620).

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

21616240340 is a wasteful number, since it uses less digits than its factorization.

21616240340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56884871 (or 56884869 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 21616240340 in words is "twenty-one billion, six hundred sixteen million, two hundred forty thousand, three hundred forty".