20213212 has 6 divisors (see below), whose sum is σ = 35373128. Its totient is φ = 10106604.

The previous prime is 20213197. The next prime is 20213233. The reversal of 20213212 is 21231202.

It is a junction number, because it is equal to n+sod(n) for n = 20213192 and 20213201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2526648 + ... + 2526655.

Almost surely, 2^20213212 is an apocalyptic number.

It is an amenable number.

20213212 is a deficient number, since it is larger than the sum of its proper divisors (15159916).

20213212 is a wasteful number, since it uses less digits than its factorization.

20213212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5053307 (or 5053305 counting only the distinct ones).

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

The square root of 20213212 is about 4495.9105862995. The cubic root of 20213212 is about 272.4029315072.

Adding to 20213212 its reverse (21231202), we get a palindrome (41444414).

The spelling of 20213212 in words is "twenty million, two hundred thirteen thousand, two hundred twelve".