21635382450 has 48 divisors (see below), whose sum is σ = 58533548256. Its totient is φ = 5244940800.

The previous prime is 21635382413. The next prime is 21635382451. The reversal of 21635382450 is 5428353612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21635382399 and 21635382408.

It is not an unprimeable number, because it can be changed into a prime (21635382451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6554527 + ... + 6557826.

It is an arithmetic number, because the mean of its divisors is an integer number (1219448922).

Almost surely, 2^21635382450 is an apocalyptic number.

21635382450 is an abundant number, since it is smaller than the sum of its proper divisors (36898165806).

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

21635382450 is a wasteful number, since it uses less digits than its factorization.

21635382450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13112379 (or 13112374 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 21635382450 in words is "twenty-one billion, six hundred thirty-five million, three hundred eighty-two thousand, four hundred fifty".