21011432131 has 4 divisors (see below), whose sum is σ = 22117297000. Its totient is φ = 19905567264.

The previous prime is 21011432077. The next prime is 21011432159. The reversal of 21011432131 is 13123411012.

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

It is a cyclic number.

It is not a de Polignac number, because 21011432131 - 2⁷ = 21011432003 is a prime.

It is a super-2 number, since 2×21011432131² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1105864849 = 21011432131 / (2 + 1 + 0 + 1 + 1 + 4 + 3 + 2 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011432099 and 21011432108.

It is not an unprimeable number, because it can be changed into a prime (21011432531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552932406 + ... + 552932443.

It is an arithmetic number, because the mean of its divisors is an integer number (5529324250).

Almost surely, 2^21011432131 is an apocalyptic number.

21011432131 is a deficient number, since it is larger than the sum of its proper divisors (1105864869).

21011432131 is a wasteful number, since it uses less digits than its factorization.

21011432131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105864868.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21011432131 its reverse (13123411012), we get a palindrome (34134843143).

The spelling of 21011432131 in words is "twenty-one billion, eleven million, four hundred thirty-two thousand, one hundred thirty-one".