21035520000 has 780 divisors, whose sum is σ = 83828528784. Its totient is φ = 5038080000.

The previous prime is 21035519987. The next prime is 21035520013. The reversal of 21035520000 is 2553012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21035519987) and next prime (21035520013).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 253439959 + ... + 253440041.

Almost surely, 2^21035520000 is an apocalyptic number.

21035520000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21035520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41914264392).

21035520000 is an abundant number, since it is smaller than the sum of its proper divisors (62793008784).

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

21035520000 is an equidigital number, since it uses as much as digits as its factorization.

21035520000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The spelling of 21035520000 in words is "twenty-one billion, thirty-five million, five hundred twenty thousand".