121022100021 has 8 divisors (see below), whose sum is σ = 161419291264. Its totient is φ = 80653154400.

The previous prime is 121022100013. The next prime is 121022100061. The reversal of 121022100021 is 120001220121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121022100021 - 2³ = 121022100013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121022100061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7051405 + ... + 7068546.

It is an arithmetic number, because the mean of its divisors is an integer number (20177411408).

Almost surely, 2^121022100021 is an apocalyptic number.

It is an amenable number.

121022100021 is a deficient number, since it is larger than the sum of its proper divisors (40397191243).

121022100021 is a wasteful number, since it uses less digits than its factorization.

121022100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14122811.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121022100021 its reverse (120001220121), we get a palindrome (241023320142).

The spelling of 121022100021 in words is "one hundred twenty-one billion, twenty-two million, one hundred thousand, twenty-one".