21123233012212 has 12 divisors (see below), whose sum is σ = 37047986633700. Its totient is φ = 10538093974016.

The previous prime is 21123233012183. The next prime is 21123233012251. The reversal of 21123233012212 is 21221033232112.

It can be written as a sum of positive squares in 2 ways, for example, as 7453915594596 + 13669317417616 = 2730186^2 + 3697204^2 .

It is a super-2 number, since 2×21123233012212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5880631003 + ... + 5880634594.

It is an arithmetic number, because the mean of its divisors is an integer number (3087332219475).

Almost surely, 2^{21123233012212} is an apocalyptic number.

It is an amenable number.

21123233012212 is a deficient number, since it is larger than the sum of its proper divisors (15924753621488).

21123233012212 is a wasteful number, since it uses less digits than its factorization.

21123233012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11761266050 (or 11761266048 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21123233012212 its reverse (21221033232112), we get a palindrome (42344266244324).

The spelling of 21123233012212 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred thirty-three million, twelve thousand, two hundred twelve".