21394683145 has 32 divisors (see below), whose sum is σ = 30763514880. Its totient is φ = 14099912640.

The previous prime is 21394683137. The next prime is 21394683169. The reversal of 21394683145 is 54138649312.

It is a happy number.

It is not a de Polignac number, because 21394683145 - 2³ = 21394683137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21394683095 and 21394683104.

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 31 ways as a sum of consecutive naturals, for example, 421039 + ... + 469108.

It is an arithmetic number, because the mean of its divisors is an integer number (961359840).

Almost surely, 2^21394683145 is an apocalyptic number.

It is an amenable number.

21394683145 is a deficient number, since it is larger than the sum of its proper divisors (9368831735).

21394683145 is a wasteful number, since it uses less digits than its factorization.

21394683145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890205.

The product of its digits is 622080, while the sum is 46.

The spelling of 21394683145 in words is "twenty-one billion, three hundred ninety-four million, six hundred eighty-three thousand, one hundred forty-five".