251220312100133 has 16 divisors (see below), whose sum is σ = 252881031513600. Its totient is φ = 249562487879280.

The previous prime is 251220312100103. The next prime is 251220312100231. The reversal of 251220312100133 is 331001213022152.

It is a cyclic number.

It is not a de Polignac number, because 251220312100133 - 2³² = 251216017132837 is a prime.

It is a super-2 number, since 2×251220312100133² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251220312100103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2880559898 + ... + 2880647108.

It is an arithmetic number, because the mean of its divisors is an integer number (15805064469600).

Almost surely, 2^{251220312100133} is an apocalyptic number.

It is an amenable number.

251220312100133 is a deficient number, since it is larger than the sum of its proper divisors (1660719413467).

251220312100133 is a wasteful number, since it uses less digits than its factorization.

251220312100133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103592.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 251220312100133 its reverse (331001213022152), we get a palindrome (582221525122285).

The spelling of 251220312100133 in words is "two hundred fifty-one trillion, two hundred twenty billion, three hundred twelve million, one hundred thousand, one hundred thirty-three".