121721054 has 32 divisors (see below), whose sum is σ = 237940416. Its totient is φ = 45319680.

The previous prime is 121721021. The next prime is 121721069. The reversal of 121721054 is 450127121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16577 + ... + 22764.

It is an arithmetic number, because the mean of its divisors is an integer number (7435638).

Almost surely, 2^121721054 is an apocalyptic number.

121721054 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

121721054 is a deficient number, since it is larger than the sum of its proper divisors (116219362).

121721054 is a wasteful number, since it uses less digits than its factorization.

121721054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39380.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 121721054 is about 11032.7264989213. The cubic root of 121721054 is about 495.5892774645.

Adding to 121721054 its reverse (450127121), we get a palindrome (571848175).

The spelling of 121721054 in words is "one hundred twenty-one million, seven hundred twenty-one thousand, fifty-four".