21311230032212 has 6 divisors (see below), whose sum is σ = 37294652556378. Its totient is φ = 10655615016104.

The previous prime is 21311230032133. The next prime is 21311230032221. The reversal of 21311230032212 is 21223003211312.

It can be written as a sum of positive squares in only one way, i.e., 12715813973776 + 8595416058436 = 3565924^2 + 2931794^2 .

It is a super-2 number, since 2×21311230032212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2663903754023 + ... + 2663903754030.

It is an arithmetic number, because the mean of its divisors is an integer number (6215775426063).

Almost surely, 2^{21311230032212} is an apocalyptic number.

It is an amenable number.

21311230032212 is a deficient number, since it is larger than the sum of its proper divisors (15983422524166).

21311230032212 is a wasteful number, since it uses less digits than its factorization.

21311230032212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5327807508057 (or 5327807508055 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21311230032212 its reverse (21223003211312), we get a palindrome (42534233243524).

Subtracting from 21311230032212 its reverse (21223003211312), we obtain a square (88226820900 = 297030²).

The spelling of 21311230032212 in words is "twenty-one trillion, three hundred eleven billion, two hundred thirty million, thirty-two thousand, two hundred twelve".