21653513350 has 48 divisors (see below), whose sum is σ = 47008562688. Its totient is φ = 7266097440.

The previous prime is 21653513347. The next prime is 21653513351. The reversal of 21653513350 is 5331535612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21653513351) 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, 641712 + ... + 674611.

It is an arithmetic number, because the mean of its divisors is an integer number (979345056).

Almost surely, 2^21653513350 is an apocalyptic number.

21653513350 is an abundant number, since it is smaller than the sum of its proper divisors (25355049338).

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

21653513350 is a wasteful number, since it uses less digits than its factorization.

21653513350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316389 (or 1316384 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 34.

The spelling of 21653513350 in words is "twenty-one billion, six hundred fifty-three million, five hundred thirteen thousand, three hundred fifty".