21010001212 has 6 divisors (see below), whose sum is σ = 36767502128. Its totient is φ = 10505000604.

The previous prime is 21010001183. The next prime is 21010001251. The reversal of 21010001212 is 21210001012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626250148 + ... + 2626250155.

Almost surely, 2^21010001212 is an apocalyptic number.

It is an amenable number.

21010001212 is a deficient number, since it is larger than the sum of its proper divisors (15757500916).

21010001212 is a wasteful number, since it uses less digits than its factorization.

21010001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5252500307 (or 5252500305 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010001212 its reverse (21210001012), we get a palindrome (42220002224).

The spelling of 21010001212 in words is "twenty-one billion, ten million, one thousand, two hundred twelve".