21135560025000 has 96 divisors (see below), whose sum is σ = 66044398200480. Its totient is φ = 5636149320000.

The previous prime is 21135560024989. The next prime is 21135560025011. The reversal of 21135560025000 is 52006553112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21135560024989) and next prime (21135560025011).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140828734 + ... + 140978733.

It is an arithmetic number, because the mean of its divisors is an integer number (687962481255).

Almost surely, 2^{21135560025000} is an apocalyptic number.

21135560025000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21135560025000 is an abundant number, since it is smaller than the sum of its proper divisors (44908838175480).

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

21135560025000 is an equidigital number, since it uses as much as digits as its factorization.

21135560025000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281807501 (or 281807477 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 21135560025000 its reverse (52006553112), we get a palindrome (21187566578112).

The spelling of 21135560025000 in words is "twenty-one trillion, one hundred thirty-five billion, five hundred sixty million, twenty-five thousand".