121653910 has 32 divisors (see below), whose sum is σ = 254004480. Its totient is φ = 41085792.

The previous prime is 121653899. The next prime is 121653913. The reversal of 121653910 is 19356121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121653913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8280 + ... + 17659.

It is an arithmetic number, because the mean of its divisors is an integer number (7937640).

Almost surely, 2^121653910 is an apocalyptic number.

121653910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121653910 is an abundant number, since it is smaller than the sum of its proper divisors (132350570).

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

121653910 is a wasteful number, since it uses less digits than its factorization.

121653910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26020.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 121653910 is about 11029.6831323479. The cubic root of 121653910 is about 495.4981347361.

The spelling of 121653910 in words is "one hundred twenty-one million, six hundred fifty-three thousand, nine hundred ten".