21220010012 has 12 divisors (see below), whose sum is σ = 38332921536. Its totient is φ = 10267746720.

The previous prime is 21220009973. The next prime is 21220010023. The reversal of 21220010012 is 21001002212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21220009975 and 21220010002.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 85564433 + ... + 85564680.

It is an arithmetic number, because the mean of its divisors is an integer number (3194410128).

Almost surely, 2^21220010012 is an apocalyptic number.

It is an amenable number.

21220010012 is a deficient number, since it is larger than the sum of its proper divisors (17112911524).

21220010012 is a wasteful number, since it uses less digits than its factorization.

21220010012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171129148 (or 171129146 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21220010012 its reverse (21001002212), we get a palindrome (42221012224).

The spelling of 21220010012 in words is "twenty-one billion, two hundred twenty million, ten thousand, twelve".