7211861972 has 12 divisors (see below), whose sum is σ = 14423724000. Its totient is φ = 3090797976.

The previous prime is 7211861971. The next prime is 7211861981. The reversal of 7211861972 is 2791681127.

7211861972 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7211861971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128783222 + ... + 128783277.

It is an arithmetic number, because the mean of its divisors is an integer number (1201977000).

Almost surely, 2^7211861972 is an apocalyptic number.

It is an amenable number.

7211861972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

7211861972 is a wasteful number, since it uses less digits than its factorization.

7211861972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257566510 (or 257566508 counting only the distinct ones).

The product of its digits is 84672, while the sum is 44.

The square root of 7211861972 is about 84922.6823175057. The cubic root of 7211861972 is about 1932.0386140651.

The spelling of 7211861972 in words is "seven billion, two hundred eleven million, eight hundred sixty-one thousand, nine hundred seventy-two".