21420058850 has 12 divisors (see below), whose sum is σ = 39841309554. Its totient is φ = 8568023520.

The previous prime is 21420058843. The next prime is 21420058867. The reversal of 21420058850 is 5885002412.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 12351877321 + 9068181529 = 111139^2 + 95227^2 .

It is a super-2 number, since 2×21420058850² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21420058850.

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, 214200539 + ... + 214200638.

Almost surely, 2^21420058850 is an apocalyptic number.

21420058850 is a deficient number, since it is larger than the sum of its proper divisors (18421250704).

21420058850 is a wasteful number, since it uses less digits than its factorization.

21420058850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428401189 (or 428401184 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 35.

The spelling of 21420058850 in words is "twenty-one billion, four hundred twenty million, fifty-eight thousand, eight hundred fifty".