20012001212 has 36 divisors (see below), whose sum is σ = 41312530224. Its totient is φ = 8455769280.

The previous prime is 20012001193. The next prime is 20012001221. The reversal of 20012001212 is 21210021002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20012001193 and 20012001202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 705113 + ... + 732944.

It is an arithmetic number, because the mean of its divisors is an integer number (1147570284).

Almost surely, 2^20012001212 is an apocalyptic number.

It is an amenable number.

20012001212 is an abundant number, since it is smaller than the sum of its proper divisors (21300529012).

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

20012001212 is a wasteful number, since it uses less digits than its factorization.

20012001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438146 (or 1438137 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20012001212 its reverse (21210021002), we get a palindrome (41222022214).

The spelling of 20012001212 in words is "twenty billion, twelve million, one thousand, two hundred twelve".