21232312213 has 16 divisors (see below), whose sum is σ = 25350802560. Its totient is φ = 17397576000.

The previous prime is 21232312201. The next prime is 21232312219. The reversal of 21232312213 is 31221323212.

It is not a de Polignac number, because 21232312213 - 2¹⁷ = 21232181141 is a prime.

It is a super-2 number, since 2×21232312213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 497283 + ... + 538288.

It is an arithmetic number, because the mean of its divisors is an integer number (1584425160).

Almost surely, 2^21232312213 is an apocalyptic number.

It is an amenable number.

21232312213 is a deficient number, since it is larger than the sum of its proper divisors (4118490347).

21232312213 is a wasteful number, since it uses less digits than its factorization.

21232312213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035708.

The product of its digits is 864, while the sum is 22.

Adding to 21232312213 its reverse (31221323212), we get a palindrome (52453635425).

The spelling of 21232312213 in words is "twenty-one billion, two hundred thirty-two million, three hundred twelve thousand, two hundred thirteen".