21401443012 has 6 divisors (see below), whose sum is σ = 37452525278. Its totient is φ = 10700721504.

The previous prime is 21401442989. The next prime is 21401443051. The reversal of 21401443012 is 21034410412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18589686336 + 2811756676 = 136344^2 + 53026^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675180373 + ... + 2675180380.

Almost surely, 2^21401443012 is an apocalyptic number.

It is an amenable number.

21401443012 is a deficient number, since it is larger than the sum of its proper divisors (16051082266).

21401443012 is a wasteful number, since it uses less digits than its factorization.

21401443012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5350360757 (or 5350360755 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21401443012 its reverse (21034410412), we get a palindrome (42435853424).

The spelling of 21401443012 in words is "twenty-one billion, four hundred one million, four hundred forty-three thousand, twelve".