21400334244 has 48 divisors (see below), whose sum is σ = 56981881600. Its totient is φ = 6940647648.

The previous prime is 21400334243. The next prime is 21400334261. The reversal of 21400334244 is 44243300412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21400334243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2673724 + ... + 2681715.

Almost surely, 2^21400334244 is an apocalyptic number.

It is an amenable number.

21400334244 is an abundant number, since it is smaller than the sum of its proper divisors (35581547356).

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

21400334244 is a wasteful number, since it uses less digits than its factorization.

21400334244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5355489 (or 5355481 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21400334244 its reverse (44243300412), we get a palindrome (65643634656).

The spelling of 21400334244 in words is "twenty-one billion, four hundred million, three hundred thirty-four thousand, two hundred forty-four".