21021000020211 has 8 divisors (see below), whose sum is σ = 28300116532480. Its totient is φ = 13877941760712.

The previous prime is 21021000020177. The next prime is 21021000020219. The reversal of 21021000020211 is 11202000012012.

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

It is not a de Polignac number, because 21021000020211 - 2²³ = 21020991631603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021000020219) 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, 34014562831 + ... + 34014563448.

It is an arithmetic number, because the mean of its divisors is an integer number (3537514566560).

Almost surely, 2^{21021000020211} is an apocalyptic number.

21021000020211 is a deficient number, since it is larger than the sum of its proper divisors (7279116512269).

21021000020211 is a wasteful number, since it uses less digits than its factorization.

21021000020211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68029126385.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021000020211 its reverse (11202000012012), we get a palindrome (32223000032223).

The spelling of 21021000020211 in words is "twenty-one trillion, twenty-one billion, twenty thousand, two hundred eleven".