21021202122211 has 8 divisors (see below), whose sum is σ = 21309266009024. Its totient is φ = 20733140998080.

The previous prime is 21021202122163. The next prime is 21021202122241. The reversal of 21021202122211 is 11222120212012.

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

It is a cyclic number.

It is not a de Polignac number, because 21021202122211 - 2¹⁹ = 21021201597923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021202122241) 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, 18116326 + ... + 19241716.

It is an arithmetic number, because the mean of its divisors is an integer number (2663658251128).

Almost surely, 2^{21021202122211} is an apocalyptic number.

21021202122211 is a deficient number, since it is larger than the sum of its proper divisors (288063886813).

21021202122211 is a wasteful number, since it uses less digits than its factorization.

21021202122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381341.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21021202122211 its reverse (11222120212012), we get a palindrome (32243322334223).

The spelling of 21021202122211 in words is "twenty-one trillion, twenty-one billion, two hundred two million, one hundred twenty-two thousand, two hundred eleven".