121210554 has 16 divisors (see below), whose sum is σ = 243654048. Its totient is φ = 40198032.

The previous prime is 121210553. The next prime is 121210597. The reversal of 121210554 is 455012121.

It is a self number, because there is not a number n which added to its sum of digits gives 121210554.

It is not an unprimeable number, because it can be changed into a prime (121210553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50092 + ... + 52455.

It is an arithmetic number, because the mean of its divisors is an integer number (15228378).

Almost surely, 2^121210554 is an apocalyptic number.

121210554 is an abundant number, since it is smaller than the sum of its proper divisors (122443494).

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

121210554 is a wasteful number, since it uses less digits than its factorization.

121210554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102749.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 121210554 is about 11009.5664764785. The cubic root of 121210554 is about 494.8954702246.

Adding to 121210554 its reverse (455012121), we get a palindrome (576222675).

The spelling of 121210554 in words is "one hundred twenty-one million, two hundred ten thousand, five hundred fifty-four".