21021202002021 has 8 divisors (see below), whose sum is σ = 30184290054240. Its totient is φ = 12936124308912.

The previous prime is 21021202001999. The next prime is 21021202002049. The reversal of 21021202002021 is 12020020212012.

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

It is not a de Polignac number, because 21021202002021 - 2⁶ = 21021202001957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021202002091) 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, 269502589731 + ... + 269502589808.

It is an arithmetic number, because the mean of its divisors is an integer number (3773036256780).

Almost surely, 2^{21021202002021} is an apocalyptic number.

It is an amenable number.

21021202002021 is a deficient number, since it is larger than the sum of its proper divisors (9163088052219).

21021202002021 is a wasteful number, since it uses less digits than its factorization.

21021202002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539005179555.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21021202002021 its reverse (12020020212012), we get a palindrome (33041222214033).

The spelling of 21021202002021 in words is "twenty-one trillion, twenty-one billion, two hundred two million, two thousand, twenty-one".