21202001212021 has 32 divisors (see below), whose sum is σ = 25230487645440. Its totient is φ = 17438055667200.

The previous prime is 21202001211931. The next prime is 21202001212061. The reversal of 21202001212021 is 12021210020212.

It is a happy number.

It is not a de Polignac number, because 21202001212021 - 2²¹ = 21201999114869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202001211986 and 21202001212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202001212061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 335034835 + ... + 335098111.

It is an arithmetic number, because the mean of its divisors is an integer number (788452738920).

Almost surely, 2^{21202001212021} is an apocalyptic number.

It is an amenable number.

21202001212021 is a deficient number, since it is larger than the sum of its proper divisors (4028486433419).

21202001212021 is a wasteful number, since it uses less digits than its factorization.

21202001212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82525.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202001212021 its reverse (12021210020212), we get a palindrome (33223211232233).

The spelling of 21202001212021 in words is "twenty-one trillion, two hundred two billion, one million, two hundred twelve thousand, twenty-one".