21240364511400 has 96 divisors (see below), whose sum is σ = 65848153305600. Its totient is φ = 5663837132800.

The previous prime is 21240364511341. The next prime is 21240364511419. The reversal of 21240364511400 is 411546304212.

It is a happy number.

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, 12445720 + ... + 14049080.

It is an arithmetic number, because the mean of its divisors is an integer number (685918263600).

Almost surely, 2^{21240364511400} is an apocalyptic number.

21240364511400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21240364511400 is an abundant number, since it is smaller than the sum of its proper divisors (44607788794200).

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

21240364511400 is a wasteful number, since it uses less digits than its factorization.

21240364511400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625459 (or 1625450 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 21240364511400 in words is "twenty-one trillion, two hundred forty billion, three hundred sixty-four million, five hundred eleven thousand, four hundred".