21388298350 has 24 divisors (see below), whose sum is σ = 40068451080. Its totient is φ = 8493767520.

The previous prime is 21388298293. The next prime is 21388298357. The reversal of 21388298350 is 5389288312.

It is a super-2 number, since 2×21388298350² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21388298294 and 21388298303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21388298357) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1531777 + ... + 1545676.

It is an arithmetic number, because the mean of its divisors is an integer number (1669518795).

Almost surely, 2^21388298350 is an apocalyptic number.

21388298350 is a deficient number, since it is larger than the sum of its proper divisors (18680152730).

21388298350 is a wasteful number, since it uses less digits than its factorization.

21388298350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077604 (or 3077599 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 21388298350 in words is "twenty-one billion, three hundred eighty-eight million, two hundred ninety-eight thousand, three hundred fifty".