21013245146 has 8 divisors (see below), whose sum is σ = 31562292384. Its totient is φ = 10492481020.

The previous prime is 21013245109. The next prime is 21013245151. The reversal of 21013245146 is 64154231012.

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

It is a super-2 number, since 2×21013245146² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7068920 + ... + 7071891.

It is an arithmetic number, because the mean of its divisors is an integer number (3945286548).

Almost surely, 2^21013245146 is an apocalyptic number.

21013245146 is a deficient number, since it is larger than the sum of its proper divisors (10549047238).

21013245146 is a wasteful number, since it uses less digits than its factorization.

21013245146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14141556.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21013245146 its reverse (64154231012), we get a palindrome (85167476158).

The spelling of 21013245146 in words is "twenty-one billion, thirteen million, two hundred forty-five thousand, one hundred forty-six".