21014451212 has 12 divisors (see below), whose sum is σ = 38710831320. Its totient is φ = 9954213696.

The previous prime is 21014451203. The next prime is 21014451223. The reversal of 21014451212 is 21215441012.

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, 138252893 + ... + 138253044.

It is an arithmetic number, because the mean of its divisors is an integer number (3225902610).

Almost surely, 2^21014451212 is an apocalyptic number.

It is an amenable number.

21014451212 is a deficient number, since it is larger than the sum of its proper divisors (17696380108).

21014451212 is a wasteful number, since it uses less digits than its factorization.

21014451212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276505960 (or 276505958 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 21014451212 its reverse (21215441012), we get a palindrome (42229892224).

The spelling of 21014451212 in words is "twenty-one billion, fourteen million, four hundred fifty-one thousand, two hundred twelve".