21002031212 has 12 divisors (see below), whose sum is σ = 36754899720. Its totient is φ = 10500631296.

The previous prime is 21002031191. The next prime is 21002031221. The reversal of 21002031212 is 21213020012.

It is a happy 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, 52364 + ... + 211532.

It is an arithmetic number, because the mean of its divisors is an integer number (3062908310).

Almost surely, 2^21002031212 is an apocalyptic number.

It is an amenable number.

21002031212 is a deficient number, since it is larger than the sum of its proper divisors (15752868508).

21002031212 is a wasteful number, since it uses less digits than its factorization.

21002031212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192160 (or 192158 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21002031212 its reverse (21213020012), we get a palindrome (42215051224).

The spelling of 21002031212 in words is "twenty-one billion, two million, thirty-one thousand, two hundred twelve".