20101213231 has 8 divisors (see below), whose sum is σ = 21936789504. Its totient is φ = 18267002520.

The previous prime is 20101213177. The next prime is 20101213241. The reversal of 20101213231 is 13231210102.

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 20101213231 - 2¹¹ = 20101211183 is a prime.

It is a super-2 number, since 2×20101213231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101213241) 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, 310485 + ... + 369598.

It is an arithmetic number, because the mean of its divisors is an integer number (2742098688).

Almost surely, 2^20101213231 is an apocalyptic number.

20101213231 is a deficient number, since it is larger than the sum of its proper divisors (1835576273).

20101213231 is a wasteful number, since it uses less digits than its factorization.

20101213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682781.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20101213231 its reverse (13231210102), we get a palindrome (33332423333).

It can be divided in two parts, 20101 and 213231, that added together give a palindrome (233332).

The spelling of 20101213231 in words is "twenty billion, one hundred one million, two hundred thirteen thousand, two hundred thirty-one".