121557002055 has 8 divisors (see below), whose sum is σ = 194491203312. Its totient is φ = 64830401088.

The previous prime is 121557002053. The next prime is 121557002057. The reversal of 121557002055 is 550200755121.

It is an interprime number because it is at equal distance from previous prime (121557002053) and next prime (121557002057).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121557002055 - 2¹ = 121557002053 is a prime.

It is a super-2 number, since 2×121557002055² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121557002051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4051900054 + ... + 4051900083.

It is an arithmetic number, because the mean of its divisors is an integer number (24311400414).

Almost surely, 2^121557002055 is an apocalyptic number.

121557002055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121557002055 is a deficient number, since it is larger than the sum of its proper divisors (72934201257).

121557002055 is an equidigital number, since it uses as much as digits as its factorization.

121557002055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8103800145.

The product of its (nonzero) digits is 17500, while the sum is 33.

Adding to 121557002055 its reverse (550200755121), we get a palindrome (671757757176).

The spelling of 121557002055 in words is "one hundred twenty-one billion, five hundred fifty-seven million, two thousand, fifty-five".