21210212021001 has 16 divisors (see below), whose sum is σ = 28326874583040. Its totient is φ = 14116846865040.

The previous prime is 21210212020961. The next prime is 21210212021021. The reversal of 21210212021001 is 10012021201212.

It is not a de Polignac number, because 21210212021001 - 2¹⁰ = 21210212019977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210212021021) 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, 64055496 + ... + 64385766.

It is an arithmetic number, because the mean of its divisors is an integer number (1770429661440).

Almost surely, 2^{21210212021001} is an apocalyptic number.

It is an amenable number.

21210212021001 is a deficient number, since it is larger than the sum of its proper divisors (7116662562039).

21210212021001 is a wasteful number, since it uses less digits than its factorization.

21210212021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365476.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210212021001 its reverse (10012021201212), we get a palindrome (31222233222213).

The spelling of 21210212021001 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, twenty-one thousand, one".