211431402131 has 4 divisors (see below), whose sum is σ = 211447181064. Its totient is φ = 211415623200.

The previous prime is 211431402097. The next prime is 211431402163. The reversal of 211431402131 is 131204134112.

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-211431402131 is a prime.

It is a super-2 number, since 2×211431402131² (a number of 23 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 = 211431402097 and 211431402106.

It is not an unprimeable number, because it can be changed into a prime (211431002131) 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, 7869350 + ... + 7896171.

It is an arithmetic number, because the mean of its divisors is an integer number (52861795266).

Almost surely, 2^211431402131 is an apocalyptic number.

211431402131 is a deficient number, since it is larger than the sum of its proper divisors (15778933).

211431402131 is a wasteful number, since it uses less digits than its factorization.

211431402131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15778932.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 211431402131 its reverse (131204134112), we get a palindrome (342635536243).

The spelling of 211431402131 in words is "two hundred eleven billion, four hundred thirty-one million, four hundred two thousand, one hundred thirty-one".