21010123245 has 16 divisors (see below), whose sum is σ = 34021213632. Its totient is φ = 11070393600.

The previous prime is 21010123223. The next prime is 21010123279. The reversal of 21010123245 is 54232101012.

It is not a de Polignac number, because 21010123245 - 2⁵ = 21010123213 is a prime.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 8436556 + ... + 8439045.

It is an arithmetic number, because the mean of its divisors is an integer number (2126325852).

Almost surely, 2^21010123245 is an apocalyptic number.

It is an amenable number.

21010123245 is a deficient number, since it is larger than the sum of its proper divisors (13011090387).

21010123245 is a wasteful number, since it uses less digits than its factorization.

21010123245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16875692.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21010123245 its reverse (54232101012), we get a palindrome (75242224257).

The spelling of 21010123245 in words is "twenty-one billion, ten million, one hundred twenty-three thousand, two hundred forty-five".