21942185450 has 12 divisors (see below), whose sum is σ = 40812465030. Its totient is φ = 8776874160.

The previous prime is 21942185437. The next prime is 21942185471. The reversal of 21942185450 is 5458124912.

It can be written as a sum of positive squares in 3 ways, for example, as 17352529441 + 4589656009 = 131729^2 + 67747^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21942185398 and 21942185407.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219421805 + ... + 219421904.

Almost surely, 2^21942185450 is an apocalyptic number.

21942185450 is a deficient number, since it is larger than the sum of its proper divisors (18870279580).

21942185450 is a wasteful number, since it uses less digits than its factorization.

21942185450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438843721 (or 438843716 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 21942185450 in words is "twenty-one billion, nine hundred forty-two million, one hundred eighty-five thousand, four hundred fifty".