121530515400550 has 24 divisors (see below), whose sum is σ = 226095486552000. Its totient is φ = 48601727040480.

The previous prime is 121530515400529. The next prime is 121530515400589. The reversal of 121530515400550 is 55004515035121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261743725 + ... + 262207624.

It is an arithmetic number, because the mean of its divisors is an integer number (9420645273000).

Almost surely, 2^{121530515400550} is an apocalyptic number.

121530515400550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121530515400550 is a deficient number, since it is larger than the sum of its proper divisors (104564971151450).

121530515400550 is a wasteful number, since it uses less digits than its factorization.

121530515400550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523956000 (or 523955995 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 37.

The spelling of 121530515400550 in words is "one hundred twenty-one trillion, five hundred thirty billion, five hundred fifteen million, four hundred thousand, five hundred fifty".