21401041344 has 56 divisors (see below), whose sum is σ = 56636960640. Its totient is φ = 7131995904.

The previous prime is 21401041331. The next prime is 21401041369. The reversal of 21401041344 is 44314010412.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1007667 + ... + 1028685.

Almost surely, 2^21401041344 is an apocalyptic number.

21401041344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21401041344 is an abundant number, since it is smaller than the sum of its proper divisors (35235919296).

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

21401041344 is a wasteful number, since it uses less digits than its factorization.

21401041344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26337 (or 26327 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21401041344 its reverse (44314010412), we get a palindrome (65715051756).

The spelling of 21401041344 in words is "twenty-one billion, four hundred one million, forty-one thousand, three hundred forty-four".