21212132131 has 16 divisors (see below), whose sum is σ = 21878599680. Its totient is φ = 20557314720.

The previous prime is 21212132111. The next prime is 21212132159. The reversal of 21212132131 is 13123121212.

It is a cyclic number.

It is not a de Polignac number, because 21212132131 - 2²⁹ = 20675261219 is a prime.

It is a super-2 number, since 2×21212132131² (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 = 21212132099 and 21212132108.

It is not an unprimeable number, because it can be changed into a prime (21212132111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1933660 + ... + 1944598.

It is an arithmetic number, because the mean of its divisors is an integer number (1367412480).

Almost surely, 2^21212132131 is an apocalyptic number.

21212132131 is a deficient number, since it is larger than the sum of its proper divisors (666467549).

21212132131 is a wasteful number, since it uses less digits than its factorization.

21212132131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11466.

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

Adding to 21212132131 its reverse (13123121212), we get a palindrome (34335253343).

The spelling of 21212132131 in words is "twenty-one billion, two hundred twelve million, one hundred thirty-two thousand, one hundred thirty-one".