21667357240 has 32 divisors (see below), whose sum is σ = 48811739760. Its totient is φ = 8656243200.

The previous prime is 21667357219. The next prime is 21667357241. The reversal of 21667357240 is 4275376612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21667357241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301521 + ... + 366400.

Almost surely, 2^21667357240 is an apocalyptic number.

21667357240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21667357240 is an abundant number, since it is smaller than the sum of its proper divisors (27144382520).

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

21667357240 is a wasteful number, since it uses less digits than its factorization.

21667357240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668743 (or 668739 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 21667357240 in words is "twenty-one billion, six hundred sixty-seven million, three hundred fifty-seven thousand, two hundred forty".