21210020212 has 24 divisors (see below), whose sum is σ = 38624493600. Its totient is φ = 10182811296.

The previous prime is 21210020201. The next prime is 21210020213. The reversal of 21210020212 is 21202001212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21210020192 and 21210020201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210020213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034887 + ... + 1055182.

It is an arithmetic number, because the mean of its divisors is an integer number (1609353900).

Almost surely, 2^21210020212 is an apocalyptic number.

It is an amenable number.

21210020212 is a deficient number, since it is larger than the sum of its proper divisors (17414473388).

21210020212 is a wasteful number, since it uses less digits than its factorization.

21210020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090175 (or 2090173 counting only the distinct ones).

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

Adding to 21210020212 its reverse (21202001212), we get a palindrome (42412021424).

The spelling of 21210020212 in words is "twenty-one billion, two hundred ten million, twenty thousand, two hundred twelve".