21401444032 has 14 divisors (see below), whose sum is σ = 42468490628. Its totient is φ = 10700721984.

The previous prime is 21401444011. The next prime is 21401444033. The reversal of 21401444032 is 23044410412.

It is a junction number, because it is equal to n+sod(n) for n = 21401443988 and 21401444006.

It is not an unprimeable number, because it can be changed into a prime (21401444033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167198718 + ... + 167198845.

Almost surely, 2^21401444032 is an apocalyptic number.

It is an amenable number.

21401444032 is a deficient number, since it is larger than the sum of its proper divisors (21067046596).

21401444032 is an equidigital number, since it uses as much as digits as its factorization.

21401444032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334397575 (or 334397565 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21401444032 its reverse (23044410412), we get a palindrome (44445854444).

The spelling of 21401444032 in words is "twenty-one billion, four hundred one million, four hundred forty-four thousand, thirty-two".