21420213132 has 12 divisors (see below), whose sum is σ = 49980497336. Its totient is φ = 7140071040.

The previous prime is 21420213119. The next prime is 21420213137. The reversal of 21420213132 is 23131202412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21420213099 and 21420213108.

It is not an unprimeable number, because it can be changed into a prime (21420213137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892508869 + ... + 892508892.

Almost surely, 2^21420213132 is an apocalyptic number.

It is an amenable number.

21420213132 is an abundant number, since it is smaller than the sum of its proper divisors (28560284204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21420213132 is a wasteful number, since it uses less digits than its factorization.

21420213132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785017768 (or 1785017766 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21420213132 its reverse (23131202412), we get a palindrome (44551415544).

The spelling of 21420213132 in words is "twenty-one billion, four hundred twenty million, two hundred thirteen thousand, one hundred thirty-two".