2021201210021 has 16 divisors (see below), whose sum is σ = 2391938183040. Its totient is φ = 1671079757760.

The previous prime is 2021201209999. The next prime is 2021201210051. The reversal of 2021201210021 is 1200121021202.

It is a de Polignac number, because none of the positive numbers 2^k-2021201210021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021201209978 and 2021201210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021201210051) 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, 4668671 + ... + 5083196.

It is an arithmetic number, because the mean of its divisors is an integer number (149496136440).

Almost surely, 2^{2021201210021} is an apocalyptic number.

It is an amenable number.

2021201210021 is a deficient number, since it is larger than the sum of its proper divisors (370736973019).

2021201210021 is a wasteful number, since it uses less digits than its factorization.

2021201210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9752924.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2021201210021 its reverse (1200121021202), we get a palindrome (3221322231223).

It can be divided in two parts, 202120 and 1210021, that added together give a palindrome (1412141).

The spelling of 2021201210021 in words is "two trillion, twenty-one billion, two hundred one million, two hundred ten thousand, twenty-one".