6621212040 has 64 divisors (see below), whose sum is σ = 19877227200. Its totient is φ = 1764448512.

The previous prime is 6621212033. The next prime is 6621212051. The reversal of 6621212040 is 402121266.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 6621212040.

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, 164646 + ... + 200874.

It is an arithmetic number, because the mean of its divisors is an integer number (310581675).

Almost surely, 2^6621212040 is an apocalyptic number.

6621212040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6621212040 is an abundant number, since it is smaller than the sum of its proper divisors (13256015160).

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

6621212040 is a wasteful number, since it uses less digits than its factorization.

6621212040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37766 (or 37762 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 6621212040 is about 81370.8304000887. The cubic root of 6621212040 is about 1877.7848551514.

The spelling of 6621212040 in words is "six billion, six hundred twenty-one million, two hundred twelve thousand, forty".