21346021612 has 6 divisors (see below), whose sum is σ = 37355537828. Its totient is φ = 10673010804.

The previous prime is 21346021591. The next prime is 21346021667. The reversal of 21346021612 is 21612064312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2668252698 + ... + 2668252705.

Almost surely, 2^21346021612 is an apocalyptic number.

It is an amenable number.

21346021612 is a deficient number, since it is larger than the sum of its proper divisors (16009516216).

21346021612 is a wasteful number, since it uses less digits than its factorization.

21346021612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5336505407 (or 5336505405 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21346021612 its reverse (21612064312), we get a palindrome (42958085924).

The spelling of 21346021612 in words is "twenty-one billion, three hundred forty-six million, twenty-one thousand, six hundred twelve".