21254463850 has 36 divisors (see below), whose sum is σ = 40215044934. Its totient is φ = 8357619040.

The previous prime is 21254463827. The next prime is 21254463859. The reversal of 21254463850 is 5836445212.

It can be written as a sum of positive squares in 3 ways, for example, as 19601960049 + 1652503801 = 140007^2 + 40651^2 .

It is not an unprimeable number, because it can be changed into a prime (21254463859) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 112992 + ... + 235108.

Almost surely, 2^21254463850 is an apocalyptic number.

21254463850 is a deficient number, since it is larger than the sum of its proper divisors (18960581084).

21254463850 is a wasteful number, since it uses less digits than its factorization.

21254463850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122247 (or 122183 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 21254463850 in words is "twenty-one billion, two hundred fifty-four million, four hundred sixty-three thousand, eight hundred fifty".