21001210220212 has 12 divisors (see below), whose sum is σ = 36780852935680. Its totient is φ = 10492395095736.

The previous prime is 21001210220191. The next prime is 21001210220303. The reversal of 21001210220212 is 21202201210012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052497838 + ... + 2052508069.

Almost surely, 2^{21001210220212} is an apocalyptic number.

It is an amenable number.

21001210220212 is a deficient number, since it is larger than the sum of its proper divisors (15779642715468).

21001210220212 is a wasteful number, since it uses less digits than its factorization.

21001210220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105007190 (or 4105007188 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21001210220212 its reverse (21202201210012), we get a palindrome (42203411430224).

The spelling of 21001210220212 in words is "twenty-one trillion, one billion, two hundred ten million, two hundred twenty thousand, two hundred twelve".