21201213121013 has 32 divisors (see below), whose sum is σ = 22632701495040. Its totient is φ = 19791079797760.

The previous prime is 21201213120961. The next prime is 21201213121037. The reversal of 21201213121013 is 31012131210212.

It is a cyclic number.

It is not a de Polignac number, because 21201213121013 - 2⁶ = 21201213120949 is a prime.

It is a super-2 number, since 2×21201213121013² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201213121043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 943564943 + ... + 943587411.

It is an arithmetic number, because the mean of its divisors is an integer number (707271921720).

Almost surely, 2^{21201213121013} is an apocalyptic number.

It is an amenable number.

21201213121013 is a deficient number, since it is larger than the sum of its proper divisors (1431488374027).

21201213121013 is a wasteful number, since it uses less digits than its factorization.

21201213121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23677.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21201213121013 its reverse (31012131210212), we get a palindrome (52213344331225).

The spelling of 21201213121013 in words is "twenty-one trillion, two hundred one billion, two hundred thirteen million, one hundred twenty-one thousand, thirteen".