21120240400002 has 40 divisors (see below), whose sum is σ = 47325701016000. Its totient is φ = 7039973338776.

The previous prime is 21120240399911. The next prime is 21120240400027. The reversal of 21120240400002 is 20000404202112.

21120240400002 is a `hidden beast` number, since 2 + 1 + 1 + 20 + 240 + 400 + 0 + 0 + 2 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10106499 + ... + 12015897.

It is an arithmetic number, because the mean of its divisors is an integer number (1183142525400).

Almost surely, 2^{21120240400002} is an apocalyptic number.

21120240400002 is an abundant number, since it is smaller than the sum of its proper divisors (26205460615998).

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

21120240400002 is a wasteful number, since it uses less digits than its factorization.

21120240400002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977692 (or 1977683 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21120240400002 its reverse (20000404202112), we get a palindrome (41120644602114).

The spelling of 21120240400002 in words is "twenty-one trillion, one hundred twenty billion, two hundred forty million, four hundred thousand, two".