21001011212 has 12 divisors (see below), whose sum is σ = 38349672816. Its totient is φ = 10043961840.

The previous prime is 21001011209. The next prime is 21001011221. The reversal of 21001011212 is 21211010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001011193 and 21001011202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114135839 + ... + 114136022.

It is an arithmetic number, because the mean of its divisors is an integer number (3195806068).

Almost surely, 2^21001011212 is an apocalyptic number.

It is an amenable number.

21001011212 is a deficient number, since it is larger than the sum of its proper divisors (17348661604).

21001011212 is a wasteful number, since it uses less digits than its factorization.

21001011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228271888 (or 228271886 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21001011212 its reverse (21211010012), we get a palindrome (42212021224).

The spelling of 21001011212 in words is "twenty-one billion, one million, eleven thousand, two hundred twelve".