21021042401400 has 96 divisors (see below), whose sum is σ = 65774252499840. Its totient is φ = 5553222399360.

The previous prime is 21021042401377. The next prime is 21021042401449. The reversal of 21021042401400 is 410424012012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163651084 + ... + 163779483.

It is an arithmetic number, because the mean of its divisors is an integer number (685148463540).

Almost surely, 2^{21021042401400} is an apocalyptic number.

21021042401400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021042401400 is an abundant number, since it is smaller than the sum of its proper divisors (44753210098440).

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

21021042401400 is a wasteful number, since it uses less digits than its factorization.

21021042401400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327430693 (or 327430684 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21021042401400 its reverse (410424012012), we get a palindrome (21431466413412).

The spelling of 21021042401400 in words is "twenty-one trillion, twenty-one billion, forty-two million, four hundred one thousand, four hundred".