21369036850 has 96 divisors (see below), whose sum is σ = 48489753600. Its totient is φ = 6843009600.

The previous prime is 21369036841. The next prime is 21369036859. The reversal of 21369036850 is 5863096312.

It is an interprime number because it is at equal distance from previous prime (21369036841) and next prime (21369036859).

It is a junction number, because it is equal to n+sod(n) for n = 21369036797 and 21369036806.

It is not an unprimeable number, because it can be changed into a prime (21369036859) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 449521 + ... + 494779.

It is an arithmetic number, because the mean of its divisors is an integer number (505101600).

Almost surely, 2^21369036850 is an apocalyptic number.

21369036850 is an abundant number, since it is smaller than the sum of its proper divisors (27120716750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21369036850 is a wasteful number, since it uses less digits than its factorization.

21369036850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45368 (or 45363 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 21369036850 in words is "twenty-one billion, three hundred sixty-nine million, thirty-six thousand, eight hundred fifty".