251790221412 has 60 divisors (see below), whose sum is σ = 680926965180. Its totient is φ = 81035930304.

The previous prime is 251790221411. The next prime is 251790221453. The reversal of 251790221412 is 214122097152.

It is a happy number.

251790221412 is a `hidden beast` number, since 2 + 5 + 17 + 9 + 0 + 221 + 412 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 70232420196 + 181557801216 = 265014^2 + 426096^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (251790221411) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13389403 + ... + 13408194.

It is an arithmetic number, because the mean of its divisors is an integer number (11348782753).

Almost surely, 2^251790221412 is an apocalyptic number.

It is an amenable number.

251790221412 is an abundant number, since it is smaller than the sum of its proper divisors (429136743768).

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

251790221412 is a wasteful number, since it uses less digits than its factorization.

251790221412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26797642 (or 26797631 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 251790221412 in words is "two hundred fifty-one billion, seven hundred ninety million, two hundred twenty-one thousand, four hundred twelve".