2021002001021 has 16 divisors (see below), whose sum is σ = 2045879035200. Its totient is φ = 1996272969600.

The previous prime is 2021002000993. The next prime is 2021002001027. The reversal of 2021002001021 is 1201002001202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2021002001021 - 2²⁶ = 2020934892157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021002000993 and 2021002001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021002001027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152418290 + ... + 152431548.

It is an arithmetic number, because the mean of its divisors is an integer number (127867439700).

Almost surely, 2^{2021002001021} is an apocalyptic number.

It is an amenable number.

2021002001021 is a deficient number, since it is larger than the sum of its proper divisors (24877034179).

2021002001021 is a wasteful number, since it uses less digits than its factorization.

2021002001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18700.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2021002001021 its reverse (1201002001202), we get a palindrome (3222004002223).

The spelling of 2021002001021 in words is "two trillion, twenty-one billion, two million, one thousand, twenty-one".