251121422450 has 12 divisors (see below), whose sum is σ = 467085845850. Its totient is φ = 100448568960.

The previous prime is 251121422429. The next prime is 251121422467. The reversal of 251121422450 is 54224121152.

It can be written as a sum of positive squares in 3 ways, for example, as 239454614281 + 11666808169 = 489341^2 + 108013^2 .

It is a super-2 number, since 2×251121422450² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2511214175 + ... + 2511214274.

Almost surely, 2^251121422450 is an apocalyptic number.

251121422450 is a deficient number, since it is larger than the sum of its proper divisors (215964423400).

251121422450 is a wasteful number, since it uses less digits than its factorization.

251121422450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5022428461 (or 5022428456 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The spelling of 251121422450 in words is "two hundred fifty-one billion, one hundred twenty-one million, four hundred twenty-two thousand, four hundred fifty".