121551000501 has 32 divisors (see below), whose sum is σ = 206437800960. Its totient is φ = 61931333376.

The previous prime is 121551000457. The next prime is 121551000511. The reversal of 121551000501 is 105000155121.

It is not a de Polignac number, because 121551000501 - 2²² = 121546806197 is a prime.

It is a super-3 number, since 3×121551000501³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121551000511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8953191 + ... + 8966756.

It is an arithmetic number, because the mean of its divisors is an integer number (6451181280).

Almost surely, 2^121551000501 is an apocalyptic number.

It is an amenable number.

121551000501 is a deficient number, since it is larger than the sum of its proper divisors (84886800459).

121551000501 is a wasteful number, since it uses less digits than its factorization.

121551000501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17919993.

The product of its (nonzero) digits is 250, while the sum is 21.

Adding to 121551000501 its reverse (105000155121), we get a palindrome (226551155622).

The spelling of 121551000501 in words is "one hundred twenty-one billion, five hundred fifty-one million, five hundred one", and thus it is an aban number.