121407155 has 4 divisors (see below), whose sum is σ = 145688592. Its totient is φ = 97125720.

The previous prime is 121407119. The next prime is 121407173. The reversal of 121407155 is 551704121.

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

It is not a de Polignac number, because 121407155 - 2⁸ = 121406899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12140711 + ... + 12140720.

It is an arithmetic number, because the mean of its divisors is an integer number (36422148).

Almost surely, 2^121407155 is an apocalyptic number.

121407155 is a deficient number, since it is larger than the sum of its proper divisors (24281437).

121407155 is an equidigital number, since it uses as much as digits as its factorization.

121407155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24281436.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 121407155 is about 11018.4915029236. The cubic root of 121407155 is about 495.1628957469.

The spelling of 121407155 in words is "one hundred twenty-one million, four hundred seven thousand, one hundred fifty-five".