21021010000221 has 128 divisors (see below), whose sum is σ = 37909559181312. Its totient is φ = 10024971264000.

The previous prime is 21021010000181. The next prime is 21021010000231. The reversal of 21021010000221 is 12200001012012.

It is not a de Polignac number, because 21021010000221 - 2⁶ = 21021010000157 is a prime.

It is a super-2 number, since 2×21021010000221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21021010000197 and 21021010000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021010000231) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1084050436 + ... + 1084069826.

It is an arithmetic number, because the mean of its divisors is an integer number (296168431104).

Almost surely, 2^{21021010000221} is an apocalyptic number.

21021010000221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21021010000221 is a deficient number, since it is larger than the sum of its proper divisors (16888549181091).

21021010000221 is a wasteful number, since it uses less digits than its factorization.

21021010000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26203.

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

Adding to 21021010000221 its reverse (12200001012012), we get a palindrome (33221011012233).

The spelling of 21021010000221 in words is "twenty-one trillion, twenty-one billion, ten million, two hundred twenty-one", and thus it is an aban number.