21153035450 has 24 divisors (see below), whose sum is σ = 39353500188. Its totient is φ = 8459310080.

The previous prime is 21153035447. The next prime is 21153035471. The reversal of 21153035450 is 5453035112.

It can be written as a sum of positive squares in 6 ways, for example, as 6553388209 + 14599647241 = 80953^2 + 120829^2 .

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, 188384 + ... + 278916.

Almost surely, 2^21153035450 is an apocalyptic number.

21153035450 is a deficient number, since it is larger than the sum of its proper divisors (18200464738).

21153035450 is a wasteful number, since it uses less digits than its factorization.

21153035450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95218 (or 95213 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The spelling of 21153035450 in words is "twenty-one billion, one hundred fifty-three million, thirty-five thousand, four hundred fifty".