121551510651 has 16 divisors (see below), whose sum is σ = 172935584640. Its totient is φ = 75717737280.

The previous prime is 121551510649. The next prime is 121551510653. The reversal of 121551510651 is 156015155121.

It is an interprime number because it is at equal distance from previous prime (121551510649) and next prime (121551510653).

It is not a de Polignac number, because 121551510651 - 2¹ = 121551510649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121551510653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14601885 + ... + 14610206.

It is an arithmetic number, because the mean of its divisors is an integer number (10808474040).

Almost surely, 2^121551510651 is an apocalyptic number.

121551510651 is a deficient number, since it is larger than the sum of its proper divisors (51384073989).

121551510651 is a wasteful number, since it uses less digits than its factorization.

121551510651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29212186.

The product of its (nonzero) digits is 7500, while the sum is 33.

Adding to 121551510651 its reverse (156015155121), we get a palindrome (277566665772).

The spelling of 121551510651 in words is "one hundred twenty-one billion, five hundred fifty-one million, five hundred ten thousand, six hundred fifty-one".