100551313521 has 20 divisors (see below), whose sum is σ = 150287831232. Its totient is φ = 66997815768.

The previous prime is 100551313519. The next prime is 100551313537. The reversal of 100551313521 is 125313155001.

100551313521 is a `hidden beast` number, since 1 + 0 + 0 + 5 + 5 + 131 + 3 + 521 = 666.

It is not a de Polignac number, because 100551313521 - 2¹ = 100551313519 is a prime.

It is a super-2 number, since 2×100551313521² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (100551313561) 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, 186445 + ... + 485658.

Almost surely, 2^100551313521 is an apocalyptic number.

It is an amenable number.

100551313521 is a deficient number, since it is larger than the sum of its proper divisors (49736517711).

100551313521 is an equidigital number, since it uses as much as digits as its factorization.

100551313521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673962 (or 673953 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

Adding to 100551313521 its reverse (125313155001), we get a palindrome (225864468522).

The spelling of 100551313521 in words is "one hundred billion, five hundred fifty-one million, three hundred thirteen thousand, five hundred twenty-one".