21010232345 has 16 divisors (see below), whose sum is σ = 25332721920. Its totient is φ = 16728016704.

The previous prime is 21010232317. The next prime is 21010232351. The reversal of 21010232345 is 54323201012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010232345 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010232345.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1451132 + ... + 1465538.

It is an arithmetic number, because the mean of its divisors is an integer number (1583295120).

Almost surely, 2^21010232345 is an apocalyptic number.

It is an amenable number.

21010232345 is a deficient number, since it is larger than the sum of its proper divisors (4322489575).

21010232345 is a wasteful number, since it uses less digits than its factorization.

21010232345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15784.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21010232345 its reverse (54323201012), we get a palindrome (75333433357).

The spelling of 21010232345 in words is "twenty-one billion, ten million, two hundred thirty-two thousand, three hundred forty-five".