121611621502 has 32 divisors (see below), whose sum is σ = 219470342400. Its totient is φ = 49371467328.

The previous prime is 121611621493. The next prime is 121611621503. The reversal of 121611621502 is 205126116121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121611621503) 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, 4820373 + ... + 4845535.

It is an arithmetic number, because the mean of its divisors is an integer number (6858448200).

Almost surely, 2^121611621502 is an apocalyptic number.

121611621502 is a deficient number, since it is larger than the sum of its proper divisors (97858720898).

121611621502 is a wasteful number, since it uses less digits than its factorization.

121611621502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43360.

The product of its (nonzero) digits is 1440, while the sum is 28.

Adding to 121611621502 its reverse (205126116121), we get a palindrome (326737737623).

The spelling of 121611621502 in words is "one hundred twenty-one billion, six hundred eleven million, six hundred twenty-one thousand, five hundred two".