121564942 has 4 divisors (see below), whose sum is σ = 182347416. Its totient is φ = 60782470.

The previous prime is 121564903. The next prime is 121564951. The reversal of 121564942 is 249465121.

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

It is a junction number, because it is equal to n+sod(n) for n = 121564898 and 121564907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30391234 + ... + 30391237.

It is an arithmetic number, because the mean of its divisors is an integer number (45586854).

Almost surely, 2^121564942 is an apocalyptic number.

121564942 is a deficient number, since it is larger than the sum of its proper divisors (60782474).

121564942 is an equidigital number, since it uses as much as digits as its factorization.

121564942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60782473.

The product of its digits is 17280, while the sum is 34.

The square root of 121564942 is about 11025.6492779337. The cubic root of 121564942 is about 495.3773159620.

The spelling of 121564942 in words is "one hundred twenty-one million, five hundred sixty-four thousand, nine hundred forty-two".