21675013450 has 24 divisors (see below), whose sum is σ = 40399735680. Its totient is φ = 8651895600.

The previous prime is 21675013387. The next prime is 21675013469. The reversal of 21675013450 is 5431057612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 428556 + ... + 476455.

It is an arithmetic number, because the mean of its divisors is an integer number (1683322320).

Almost surely, 2^21675013450 is an apocalyptic number.

21675013450 is a deficient number, since it is larger than the sum of its proper divisors (18724722230).

21675013450 is a wasteful number, since it uses less digits than its factorization.

21675013450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905502 (or 905497 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 21675013450 in words is "twenty-one billion, six hundred seventy-five million, thirteen thousand, four hundred fifty".