21131430032212 has 12 divisors (see below), whose sum is σ = 36981576538900. Its totient is φ = 10565265306816.

The previous prime is 21131430032197. The next prime is 21131430032257. The reversal of 21131430032212 is 21223003413112.

It can be written as a sum of positive squares in 2 ways, for example, as 10891148430276 + 10240281601936 = 3300174^2 + 3200044^2 .

It is a super-2 number, since 2×21131430032212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112321587 + ... + 112509562.

Almost surely, 2^{21131430032212} is an apocalyptic number.

It is an amenable number.

21131430032212 is a deficient number, since it is larger than the sum of its proper divisors (15850146506688).

21131430032212 is a wasteful number, since it uses less digits than its factorization.

21131430032212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224854650 (or 224854648 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21131430032212 its reverse (21223003413112), we get a palindrome (42354433445324).

The spelling of 21131430032212 in words is "twenty-one trillion, one hundred thirty-one billion, four hundred thirty million, thirty-two thousand, two hundred twelve".