20213321212 has 24 divisors (see below), whose sum is σ = 40434186240. Its totient is φ = 8661235440.

The previous prime is 20213321197. The next prime is 20213321221. The reversal of 20213321212 is 21212331202.

It is a self number, because there is not a number n which added to its sum of digits gives 20213321212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91989 + ... + 221107.

It is an arithmetic number, because the mean of its divisors is an integer number (1684757760).

Almost surely, 2^20213321212 is an apocalyptic number.

It is an amenable number.

20213321212 is an abundant number, since it is smaller than the sum of its proper divisors (20220865028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20213321212 is a wasteful number, since it uses less digits than its factorization.

20213321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134721 (or 134719 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20213321212 its reverse (21212331202), we get a palindrome (41425652414).

It can be divided in two parts, 2021 and 3321212, that added together give a palindrome (3323233).

The spelling of 20213321212 in words is "twenty billion, two hundred thirteen million, three hundred twenty-one thousand, two hundred twelve".