21144040323400 has 48 divisors (see below), whose sum is σ = 49289603410800. Its totient is φ = 8435300489280.

The previous prime is 21144040323389. The next prime is 21144040323409. The reversal of 21144040323400 is 432304044112.

It is not an unprimeable number, because it can be changed into a prime (21144040323409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139396762 + ... + 139548361.

It is an arithmetic number, because the mean of its divisors is an integer number (1026866737725).

Almost surely, 2^{21144040323400} is an apocalyptic number.

21144040323400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21144040323400 is an abundant number, since it is smaller than the sum of its proper divisors (28145563087400).

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

21144040323400 is a wasteful number, since it uses less digits than its factorization.

21144040323400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278945518 (or 278945509 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21144040323400 its reverse (432304044112), we get a palindrome (21576344367512).

The spelling of 21144040323400 in words is "twenty-one trillion, one hundred forty-four billion, forty million, three hundred twenty-three thousand, four hundred".