21444423410 has 32 divisors (see below), whose sum is σ = 39160143792. Its totient is φ = 8454021120.

The previous prime is 21444423409. The next prime is 21444423457. The reversal of 21444423410 is 1432444412.

It can be written as a sum of positive squares in 8 ways, for example, as 17667460561 + 3776962849 = 132919^2 + 61457^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187904 + ... + 279636.

Almost surely, 2^21444423410 is an apocalyptic number.

21444423410 is a deficient number, since it is larger than the sum of its proper divisors (17715720382).

21444423410 is a wasteful number, since it uses less digits than its factorization.

21444423410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92078.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21444423410 its reverse (1432444412), we get a palindrome (22876867822).

The spelling of 21444423410 in words is "twenty-one billion, four hundred forty-four million, four hundred twenty-three thousand, four hundred ten".