121521610 has 48 divisors (see below), whose sum is σ = 265601664. Its totient is φ = 39207168.

The previous prime is 121521607. The next prime is 121521613. The reversal of 121521610 is 16125121.

It is an interprime number because it is at equal distance from previous prime (121521607) and next prime (121521613).

It is not an unprimeable number, because it can be changed into a prime (121521613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17227 + ... + 23233.

It is an arithmetic number, because the mean of its divisors is an integer number (5533368).

Almost surely, 2^121521610 is an apocalyptic number.

121521610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121521610 is an abundant number, since it is smaller than the sum of its proper divisors (144080054).

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

121521610 is a wasteful number, since it uses less digits than its factorization.

121521610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6055 (or 6038 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 121521610 is about 11023.6840484477. The cubic root of 121521610 is about 495.3184496461.

Adding to 121521610 its reverse (16125121), we get a palindrome (137646731).

It can be divided in two parts, 121 and 521610, that added together give a triangular number (521731 = T₁₀₂₁).

The spelling of 121521610 in words is "one hundred twenty-one million, five hundred twenty-one thousand, six hundred ten".