21512332540100 has 18 divisors (see below), whose sum is σ = 46681761612234. Its totient is φ = 8604933016000.

The previous prime is 21512332540057. The next prime is 21512332540141. The reversal of 21512332540100 is 104523321512.

It can be written as a sum of positive squares in 3 ways, for example, as 368944478464 + 21143388061636 = 607408^2 + 4598194^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107561662601 + ... + 107561662800.

Almost surely, 2^{21512332540100} is an apocalyptic number.

21512332540100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21512332540100 is an abundant number, since it is smaller than the sum of its proper divisors (25169429072134).

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

21512332540100 is a wasteful number, since it uses less digits than its factorization.

21512332540100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215123325415 (or 215123325408 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21512332540100 its reverse (104523321512), we get a palindrome (21616855861612).

The spelling of 21512332540100 in words is "twenty-one trillion, five hundred twelve billion, three hundred thirty-two million, five hundred forty thousand, one hundred".