121771955 has 4 divisors (see below), whose sum is σ = 146126352. Its totient is φ = 97417560.

The previous prime is 121771933. The next prime is 121771973. The reversal of 121771955 is 559177121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 559177121 = 89 ⋅6282889.

It is not a de Polignac number, because 121771955 - 2¹² = 121767859 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, 12177191 + ... + 12177200.

It is an arithmetic number, because the mean of its divisors is an integer number (36531588).

Almost surely, 2^121771955 is an apocalyptic number.

121771955 is a deficient number, since it is larger than the sum of its proper divisors (24354397).

121771955 is an equidigital number, since it uses as much as digits as its factorization.

121771955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24354396.

The product of its digits is 22050, while the sum is 38.

The square root of 121771955 is about 11035.0330765250. The cubic root of 121771955 is about 495.6583492574.

The spelling of 121771955 in words is "one hundred twenty-one million, seven hundred seventy-one thousand, nine hundred fifty-five".