121551554010 has 16 divisors (see below), whose sum is σ = 291723729696. Its totient is φ = 32413747728.

The previous prime is 121551553973. The next prime is 121551554011. The reversal of 121551554010 is 10455155121.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 4051718467 = 121551554010 / (1 + 2 + 1 + 5 + 5 + 1 + 5 + 5 + 4 + 0 + 1 + 0).

It is not an unprimeable number, because it can be changed into a prime (121551554011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2025859204 + ... + 2025859263.

It is an arithmetic number, because the mean of its divisors is an integer number (18232733106).

Almost surely, 2^121551554010 is an apocalyptic number.

121551554010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121551554010 is an abundant number, since it is smaller than the sum of its proper divisors (170172175686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121551554010 is a wasteful number, since it uses less digits than its factorization.

121551554010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051718477.

The product of its (nonzero) digits is 5000, while the sum is 30.

The spelling of 121551554010 in words is "one hundred twenty-one billion, five hundred fifty-one million, five hundred fifty-four thousand, ten".