21320123202 has 48 divisors (see below), whose sum is σ = 54219527232. Its totient is φ = 5926828320.

The previous prime is 21320123197. The next prime is 21320123203. The reversal of 21320123202 is 20232102312.

21320123202 is a `hidden beast` number, since 21 + 320 + 1 + 2 + 320 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21320123203) 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 23 ways as a sum of consecutive naturals, for example, 2281924 + ... + 2291247.

It is an arithmetic number, because the mean of its divisors is an integer number (1129573484).

Almost surely, 2^21320123202 is an apocalyptic number.

21320123202 is an abundant number, since it is smaller than the sum of its proper divisors (32899404030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21320123202 is a wasteful number, since it uses less digits than its factorization.

21320123202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4573223 (or 4573220 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21320123202 its reverse (20232102312), we get a palindrome (41552225514).

The spelling of 21320123202 in words is "twenty-one billion, three hundred twenty million, one hundred twenty-three thousand, two hundred two".