121422821905 has 32 divisors (see below), whose sum is σ = 181693617408. Its totient is φ = 75678624000.

The previous prime is 121422821837. The next prime is 121422821909. The reversal of 121422821905 is 509128224121.

It is a de Polignac number, because none of the positive numbers 2^k-121422821905 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121422821909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2400859 + ... + 2450911.

It is an arithmetic number, because the mean of its divisors is an integer number (5677925544).

Almost surely, 2^121422821905 is an apocalyptic number.

It is an amenable number.

121422821905 is a deficient number, since it is larger than the sum of its proper divisors (60270795503).

121422821905 is a wasteful number, since it uses less digits than its factorization.

121422821905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56377.

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 121422821905 in words is "one hundred twenty-one billion, four hundred twenty-two million, eight hundred twenty-one thousand, nine hundred five".