55121502129 has 16 divisors (see below), whose sum is σ = 78518196480. Its totient is φ = 34293972240.

The previous prime is 55121502119. The next prime is 55121502209. The reversal of 55121502129 is 92120512155.

It is not a de Polignac number, because 55121502129 - 2⁵ = 55121502097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55121502129.

It is not an unprimeable number, because it can be changed into a prime (55121502119) 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, 7212927 + ... + 7220564.

It is an arithmetic number, because the mean of its divisors is an integer number (4907387280).

Almost surely, 2^55121502129 is an apocalyptic number.

It is an amenable number.

55121502129 is a deficient number, since it is larger than the sum of its proper divisors (23396694351).

55121502129 is a wasteful number, since it uses less digits than its factorization.

55121502129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14433580.

The product of its (nonzero) digits is 9000, while the sum is 33.

The spelling of 55121502129 in words is "fifty-five billion, one hundred twenty-one million, five hundred two thousand, one hundred twenty-nine".