21064402132 has 6 divisors (see below), whose sum is σ = 36862703738. Its totient is φ = 10532201064.

The previous prime is 21064402127. The next prime is 21064402141. The reversal of 21064402132 is 23120446012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21063877956 + 524176 = 145134^2 + 724^2 .

It is a super-2 number, since 2×21064402132² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21064402097 and 21064402106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2633050263 + ... + 2633050270.

Almost surely, 2^21064402132 is an apocalyptic number.

It is an amenable number.

21064402132 is a deficient number, since it is larger than the sum of its proper divisors (15798301606).

21064402132 is a wasteful number, since it uses less digits than its factorization.

21064402132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266100537 (or 5266100535 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21064402132 its reverse (23120446012), we get a palindrome (44184848144).

The spelling of 21064402132 in words is "twenty-one billion, sixty-four million, four hundred two thousand, one hundred thirty-two".