21348390586 has 8 divisors (see below), whose sum is σ = 32100881940. Its totient is φ = 10648096608.

The previous prime is 21348390559. The next prime is 21348390587. The reversal of 21348390586 is 68509384312.

It can be written as a sum of positive squares in 2 ways, for example, as 21339658561 + 8732025 = 146081^2 + 2955^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21348390586² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21348390587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13048321 + ... + 13049956.

Almost surely, 2^21348390586 is an apocalyptic number.

21348390586 is a deficient number, since it is larger than the sum of its proper divisors (10752491354).

21348390586 is a wasteful number, since it uses less digits than its factorization.

21348390586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26098688.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 21348390586 in words is "twenty-one billion, three hundred forty-eight million, three hundred ninety thousand, five hundred eighty-six".