20111021212 has 12 divisors (see below), whose sum is σ = 35205276960. Its totient is φ = 10052370656.

The previous prime is 20111021197. The next prime is 20111021237. The reversal of 20111021212 is 21212011102.

It is a junction number, because it is equal to n+sod(n) for n = 20111021192 and 20111021201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770548 + ... + 796219.

It is an arithmetic number, because the mean of its divisors is an integer number (2933773080).

Almost surely, 2^20111021212 is an apocalyptic number.

It is an amenable number.

20111021212 is a deficient number, since it is larger than the sum of its proper divisors (15094255748).

20111021212 is a wasteful number, since it uses less digits than its factorization.

20111021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569980 (or 1569978 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20111021212 its reverse (21212011102), we get a palindrome (41323032314).

The spelling of 20111021212 in words is "twenty billion, one hundred eleven million, twenty-one thousand, two hundred twelve".