121045906 has 4 divisors (see below), whose sum is σ = 181568862. Its totient is φ = 60522952.

The previous prime is 121045889. The next prime is 121045943. The reversal of 121045906 is 609540121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 71554681 + 49491225 = 8459^2 + 7035^2 .

It is a super-2 number, since 2×121045906² = 29304222718721672, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 30261475 + ... + 30261478.

Almost surely, 2^121045906 is an apocalyptic number.

121045906 is a deficient number, since it is larger than the sum of its proper divisors (60522956).

121045906 is an equidigital number, since it uses as much as digits as its factorization.

121045906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60522955.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 121045906 is about 11002.0864384897. The cubic root of 121045906 is about 494.6712860280.

The spelling of 121045906 in words is "one hundred twenty-one million, forty-five thousand, nine hundred six".