21012000002221 has 8 divisors (see below), whose sum is σ = 22117966642080. Its totient is φ = 19906040552688.

The previous prime is 21012000002209. The next prime is 21012000002303. The reversal of 21012000002221 is 12220000021012.

It is a happy number.

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 21012000002221 - 2³¹ = 21009852518573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012000002321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4826715 + ... + 8082151.

It is an arithmetic number, because the mean of its divisors is an integer number (2764745830260).

Almost surely, 2^{21012000002221} is an apocalyptic number.

It is an amenable number.

21012000002221 is a deficient number, since it is larger than the sum of its proper divisors (1105966639859).

21012000002221 is a wasteful number, since it uses less digits than its factorization.

21012000002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3595163.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21012000002221 its reverse (12220000021012), we get a palindrome (33232000023233).

The spelling of 21012000002221 in words is "twenty-one trillion, twelve billion, two thousand, two hundred twenty-one".