21000132000 has 144 divisors (see below), whose sum is σ = 74529596232. Its totient is φ = 5600025600.

The previous prime is 21000131989. The next prime is 21000132029. The reversal of 21000132000 is 23100012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6389124624 + 14611007376 = 79932^2 + 120876^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 255669 + ... + 327668.

Almost surely, 2^21000132000 is an apocalyptic number.

21000132000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000132000 is an abundant number, since it is smaller than the sum of its proper divisors (53529464232).

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

21000132000 is a wasteful number, since it uses less digits than its factorization.

21000132000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583368 (or 583347 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21000132000 its reverse (23100012), we get a palindrome (21023232012).

The spelling of 21000132000 in words is "twenty-one billion, one hundred thirty-two thousand".