21449875601 has 48 divisors (see below), whose sum is σ = 28859486208. Its totient is φ = 15470848800.

The previous prime is 21449875597. The next prime is 21449875633. The reversal of 21449875601 is 10657894412.

It is a happy number.

It is not a de Polignac number, because 21449875601 - 2² = 21449875597 is a prime.

It is a super-2 number, since 2×21449875601² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21449875661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1254230 + ... + 1271216.

It is an arithmetic number, because the mean of its divisors is an integer number (601239296).

Almost surely, 2^21449875601 is an apocalyptic number.

It is an amenable number.

21449875601 is a deficient number, since it is larger than the sum of its proper divisors (7409610607).

21449875601 is a wasteful number, since it uses less digits than its factorization.

21449875601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17082 (or 17059 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 21449875601 in words is "twenty-one billion, four hundred forty-nine million, eight hundred seventy-five thousand, six hundred one".