21120020212 has 24 divisors (see below), whose sum is σ = 37441958400. Its totient is φ = 10422418656.

The previous prime is 21120020203. The next prime is 21120020221. The reversal of 21120020212 is 21202002112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21120020203) and next prime (21120020221).

It is a junction number, because it is equal to n+sod(n) for n = 21120020192 and 21120020201.

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, 944214 + ... + 966322.

It is an arithmetic number, because the mean of its divisors is an integer number (1560081600).

Almost surely, 2^21120020212 is an apocalyptic number.

It is an amenable number.

21120020212 is a deficient number, since it is larger than the sum of its proper divisors (16321938188).

21120020212 is a wasteful number, since it uses less digits than its factorization.

21120020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25215 (or 25213 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21120020212 its reverse (21202002112), we get a palindrome (42322022324).

The spelling of 21120020212 in words is "twenty-one billion, one hundred twenty million, twenty thousand, two hundred twelve".