21001001212 has 12 divisors (see below), whose sum is σ = 37937292736. Its totient is φ = 10161774720.

The previous prime is 21001001209. The next prime is 21001001227. The reversal of 21001001212 is 21210010012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84681333 + ... + 84681580.

Almost surely, 2^21001001212 is an apocalyptic number.

It is an amenable number.

21001001212 is a deficient number, since it is larger than the sum of its proper divisors (16936291524).

21001001212 is a wasteful number, since it uses less digits than its factorization.

21001001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169362948 (or 169362946 counting only the distinct ones).

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

Adding to 21001001212 its reverse (21210010012), we get a palindrome (42211011224).

The spelling of 21001001212 in words is "twenty-one billion, one million, one thousand, two hundred twelve".