21000022312 has 8 divisors (see below), whose sum is σ = 39375041850. Its totient is φ = 10500011152.

The previous prime is 21000022301. The next prime is 21000022331. The reversal of 21000022312 is 21322000012.

It can be written as a sum of positive squares in only one way, i.e., 11424616996 + 9575405316 = 106886^2 + 97854^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×21000022312³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000022292 and 21000022301.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1312501387 + ... + 1312501402.

Almost surely, 2^21000022312 is an apocalyptic number.

It is an amenable number.

21000022312 is a deficient number, since it is larger than the sum of its proper divisors (18375019538).

21000022312 is a wasteful number, since it uses less digits than its factorization.

21000022312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625002795 (or 2625002791 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21000022312 its reverse (21322000012), we get a palindrome (42322022324).

The spelling of 21000022312 in words is "twenty-one billion, twenty-two thousand, three hundred twelve".