21444001402 has 8 divisors (see below), whose sum is σ = 32170072500. Its totient is φ = 10720643904.

The previous prime is 21444001393. The next prime is 21444001421. The reversal of 21444001402 is 20410044412.

It can be written as a sum of positive squares in 2 ways, for example, as 19154283201 + 2289718201 = 138399^2 + 47851^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21444001402² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 658527 + ... + 690322.

Almost surely, 2^21444001402 is an apocalyptic number.

21444001402 is a deficient number, since it is larger than the sum of its proper divisors (10726071098).

21444001402 is a wasteful number, since it uses less digits than its factorization.

21444001402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356800.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21444001402 its reverse (20410044412), we get a palindrome (41854045814).

The spelling of 21444001402 in words is "twenty-one billion, four hundred forty-four million, one thousand, four hundred two".