121020241155 has 32 divisors (see below), whose sum is σ = 223660942848. Its totient is φ = 55224921600.

The previous prime is 121020241123. The next prime is 121020241171. The reversal of 121020241155 is 551142020121.

It is a happy number.

It is not a de Polignac number, because 121020241155 - 2⁵ = 121020241123 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21569431 + ... + 21575040.

It is an arithmetic number, because the mean of its divisors is an integer number (6989404464).

Almost surely, 2^121020241155 is an apocalyptic number.

121020241155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121020241155 is a deficient number, since it is larger than the sum of its proper divisors (102640701693).

121020241155 is a wasteful number, since it uses less digits than its factorization.

121020241155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43144507.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 121020241155 its reverse (551142020121), we get a palindrome (672162261276).

The spelling of 121020241155 in words is "one hundred twenty-one billion, twenty million, two hundred forty-one thousand, one hundred fifty-five".