21201200021002 has 16 divisors (see below), whose sum is σ = 32327068593672. Its totient is φ = 10425552721920.

The previous prime is 21201200020981. The next prime is 21201200021059. The reversal of 21201200021002 is 20012000210212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7438650757321 + 13762549263681 = 2727389^2 + 3709791^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9549463 + ... + 11558314.

Almost surely, 2^{21201200021002} is an apocalyptic number.

21201200021002 is a deficient number, since it is larger than the sum of its proper divisors (11125868572670).

21201200021002 is a wasteful number, since it uses less digits than its factorization.

21201200021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21116073.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21201200021002 its reverse (20012000210212), we get a palindrome (41213200231214).

The spelling of 21201200021002 in words is "twenty-one trillion, two hundred one billion, two hundred million, twenty-one thousand, two".