21021022212001 has 64 divisors (see below), whose sum is σ = 26114688230400. Its totient is φ = 16514128502784.

The previous prime is 21021022211963. The next prime is 21021022212079. The reversal of 21021022212001 is 10021222012012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21021022212001 - 2⁷ = 21021022211873 is a prime.

It is a super-3 number, since 3×21021022212001³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21021022212101) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 192733455 + ... + 192842491.

It is an arithmetic number, because the mean of its divisors is an integer number (408042003600).

Almost surely, 2^{21021022212001} is an apocalyptic number.

It is an amenable number.

21021022212001 is a deficient number, since it is larger than the sum of its proper divisors (5093666018399).

21021022212001 is a wasteful number, since it uses less digits than its factorization.

21021022212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109426.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21021022212001 its reverse (10021222012012), we get a palindrome (31042244224013).

The spelling of 21021022212001 in words is "twenty-one trillion, twenty-one billion, twenty-two million, two hundred twelve thousand, one".