21201233131 has 8 divisors (see below), whose sum is σ = 22897523600. Its totient is φ = 19514289312.

The previous prime is 21201233129. The next prime is 21201233147. The reversal of 21201233131 is 13133210212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21201233131 - 2¹ = 21201233129 is a prime.

It is a super-2 number, since 2×21201233131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201233099 and 21201233108.

It is not an unprimeable number, because it can be changed into a prime (21201233101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2331945 + ... + 2341018.

It is an arithmetic number, because the mean of its divisors is an integer number (2862190450).

Almost surely, 2^21201233131 is an apocalyptic number.

21201233131 is a deficient number, since it is larger than the sum of its proper divisors (1696290469).

21201233131 is a wasteful number, since it uses less digits than its factorization.

21201233131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4673325.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21201233131 its reverse (13133210212), we get a palindrome (34334443343).

The spelling of 21201233131 in words is "twenty-one billion, two hundred one million, two hundred thirty-three thousand, one hundred thirty-one".