21011210002221 has 8 divisors (see below), whose sum is σ = 28019754475104. Its totient is φ = 14005069432080.

The previous prime is 21011210002201. The next prime is 21011210002241. The reversal of 21011210002221 is 12220001211012.

It is an interprime number because it is at equal distance from previous prime (21011210002201) and next prime (21011210002241).

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

It is not a de Polignac number, because 21011210002221 - 2⁷ = 21011210002093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21011210002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011210002201) 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, 600955290 + ... + 600990251.

It is an arithmetic number, because the mean of its divisors is an integer number (3502469309388).

Almost surely, 2^{21011210002221} is an apocalyptic number.

It is an amenable number.

21011210002221 is a deficient number, since it is larger than the sum of its proper divisors (7008544472883).

21011210002221 is a wasteful number, since it uses less digits than its factorization.

21011210002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201951371.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21011210002221 its reverse (12220001211012), we get a palindrome (33231211213233).

The spelling of 21011210002221 in words is "twenty-one trillion, eleven billion, two hundred ten million, two thousand, two hundred twenty-one".