2121121022021 has 8 divisors (see below), whose sum is σ = 2122283298240. Its totient is φ = 2119959070912.

The previous prime is 2121121022011. The next prime is 2121121022029. The reversal of 2121121022021 is 1202201211212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121121022021 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 (2121121022029) 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, 13593581 + ... + 13748733.

It is an arithmetic number, because the mean of its divisors is an integer number (265285412280).

Almost surely, 2^{2121121022021} is an apocalyptic number.

It is an amenable number.

2121121022021 is a deficient number, since it is larger than the sum of its proper divisors (1162276219).

2121121022021 is a wasteful number, since it uses less digits than its factorization.

2121121022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162555.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2121121022021 its reverse (1202201211212), we get a palindrome (3323322233233).

The spelling of 2121121022021 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, twenty-two thousand, twenty-one".