21232312210 has 16 divisors (see below), whose sum is σ = 38304441216. Its totient is φ = 8473751728.

The previous prime is 21232312201. The next prime is 21232312219. The reversal of 21232312210 is 1221323212.

It is an interprime number because it is at equal distance from previous prime (21232312201) and next prime (21232312219).

It is a super-2 number, since 2×21232312210² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21232312219) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2391994 + ... + 2400853.

It is an arithmetic number, because the mean of its divisors is an integer number (2394027576).

Almost surely, 2^21232312210 is an apocalyptic number.

21232312210 is a deficient number, since it is larger than the sum of its proper divisors (17072129006).

21232312210 is a wasteful number, since it uses less digits than its factorization.

21232312210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4793297.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21232312210 its reverse (1221323212), we get a palindrome (22453635422).

The spelling of 21232312210 in words is "twenty-one billion, two hundred thirty-two million, three hundred twelve thousand, two hundred ten".