20211234131 has 4 divisors (see below), whose sum is σ = 22048619064. Its totient is φ = 18373849200.

The previous prime is 20211234119. The next prime is 20211234157. The reversal of 20211234131 is 13143211202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211234131 is a prime.

It is a super-2 number, since 2×20211234131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211264131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918692450 + ... + 918692471.

It is an arithmetic number, because the mean of its divisors is an integer number (5512154766).

Almost surely, 2^20211234131 is an apocalyptic number.

20211234131 is a deficient number, since it is larger than the sum of its proper divisors (1837384933).

20211234131 is a wasteful number, since it uses less digits than its factorization.

20211234131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837384932.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20211234131 its reverse (13143211202), we get a palindrome (33354445333).

The spelling of 20211234131 in words is "twenty billion, two hundred eleven million, two hundred thirty-four thousand, one hundred thirty-one".