21021002210001 has 16 divisors (see below), whose sum is σ = 28231771519808. Its totient is φ = 13912451784000.

The previous prime is 21021002209997. The next prime is 21021002210003. The reversal of 21021002210001 is 10001220012012.

It is not a de Polignac number, because 21021002210001 - 2² = 21021002209997 is a prime.

It is a super-2 number, since 2×21021002210001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021002210003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41573050 + ... + 42075651.

It is an arithmetic number, because the mean of its divisors is an integer number (1764485719988).

Almost surely, 2^{21021002210001} is an apocalyptic number.

It is an amenable number.

21021002210001 is a deficient number, since it is larger than the sum of its proper divisors (7210769309807).

21021002210001 is a wasteful number, since it uses less digits than its factorization.

21021002210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83649312.

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

Adding to 21021002210001 its reverse (10001220012012), we get a palindrome (31022222222013).

The spelling of 21021002210001 in words is "twenty-one trillion, twenty-one billion, two million, two hundred ten thousand, one".