6721721262172 has 48 divisors (see below), whose sum is σ = 13618354176000. Its totient is φ = 2843282018304.

The previous prime is 6721721262131. The next prime is 6721721262241. The reversal of 6721721262172 is 2712621271276.

It is a congruent number.

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, 5840604 + ... + 6896092.

It is an arithmetic number, because the mean of its divisors is an integer number (283715712000).

Almost surely, 2^{6721721262172} is an apocalyptic number.

It is an amenable number.

6721721262172 is an abundant number, since it is smaller than the sum of its proper divisors (6896632913828).

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

6721721262172 is a wasteful number, since it uses less digits than its factorization.

6721721262172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058458 (or 1058456 counting only the distinct ones).

The product of its digits is 395136, while the sum is 46.

The spelling of 6721721262172 in words is "six trillion, seven hundred twenty-one billion, seven hundred twenty-one million, two hundred sixty-two thousand, one hundred seventy-two".