21347465450 has 24 divisors (see below), whose sum is σ = 40357214220. Its totient is φ = 8399001600.

The previous prime is 21347465441. The next prime is 21347465453. The reversal of 21347465450 is 5456474312.

It can be written as a sum of positive squares in 6 ways, for example, as 1269425641 + 20078039809 = 35629^2 + 141697^2 .

It is a super-2 number, since 2×21347465450² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21347465398 and 21347465407.

It is not an unprimeable number, because it can be changed into a prime (21347465453) 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, 3496535 + ... + 3502634.

Almost surely, 2^21347465450 is an apocalyptic number.

21347465450 is a deficient number, since it is larger than the sum of its proper divisors (19009748770).

21347465450 is a wasteful number, since it uses less digits than its factorization.

21347465450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6999242 (or 6999237 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 21347465450 in words is "twenty-one billion, three hundred forty-seven million, four hundred sixty-five thousand, four hundred fifty".