21013144870 has 32 divisors (see below), whose sum is σ = 38042649216. Its totient is φ = 8356656000.

The previous prime is 21013144861. The next prime is 21013144871. The reversal of 21013144870 is 7844131012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013144871) by changing a digit.

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, 3683020 + ... + 3688720.

It is an arithmetic number, because the mean of its divisors is an integer number (1188832788).

Almost surely, 2^21013144870 is an apocalyptic number.

21013144870 is a deficient number, since it is larger than the sum of its proper divisors (17029504346).

21013144870 is a wasteful number, since it uses less digits than its factorization.

21013144870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7776.

The product of its (nonzero) digits is 5376, while the sum is 31.

Adding to 21013144870 its reverse (7844131012), we get a palindrome (28857275882).

The spelling of 21013144870 in words is "twenty-one billion, thirteen million, one hundred forty-four thousand, eight hundred seventy".