2121010102021 has 4 divisors (see below), whose sum is σ = 2125365359392. Its totient is φ = 2116654844652.

The previous prime is 2121010102007. The next prime is 2121010102033. The reversal of 2121010102021 is 1202010101212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121010102021 - 2⁷ = 2121010101893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121010101992 and 2121010102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121010102051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2177627955 + ... + 2177628928.

It is an arithmetic number, because the mean of its divisors is an integer number (531341339848).

Almost surely, 2^{2121010102021} is an apocalyptic number.

It is an amenable number.

2121010102021 is a deficient number, since it is larger than the sum of its proper divisors (4355257371).

2121010102021 is an equidigital number, since it uses as much as digits as its factorization.

2121010102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4355257370.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2121010102021 its reverse (1202010101212), we get a palindrome (3323020203233).

The spelling of 2121010102021 in words is "two trillion, one hundred twenty-one billion, ten million, one hundred two thousand, twenty-one".