21021020210207 has 8 divisors (see below), whose sum is σ = 21058421224800. Its totient is φ = 20983620801024.

The previous prime is 21021020210159. The next prime is 21021020210219. The reversal of 21021020210207 is 70201202012012.

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 21021020210207 - 2⁴² = 16622973699103 is a prime.

It is a super-2 number, since 2×21021020210207² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021020210227) 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, 27536894 + ... + 28289972.

It is an arithmetic number, because the mean of its divisors is an integer number (2632302653100).

Almost surely, 2^{21021020210207} is an apocalyptic number.

21021020210207 is a deficient number, since it is larger than the sum of its proper divisors (37401014593).

21021020210207 is an equidigital number, since it uses as much as digits as its factorization.

21021020210207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802705.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 21021020210207 its reverse (70201202012012), we get a palindrome (91222222222219).

The spelling of 21021020210207 in words is "twenty-one trillion, twenty-one billion, twenty million, two hundred ten thousand, two hundred seven".