21213020012 has 24 divisors (see below), whose sum is σ = 38227375872. Its totient is φ = 10293622400.

The previous prime is 21213020011. The next prime is 21213020029. The reversal of 21213020012 is 21002031212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21213020011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307283 + ... + 369930.

It is an arithmetic number, because the mean of its divisors is an integer number (1592807328).

Almost surely, 2^21213020012 is an apocalyptic number.

It is an amenable number.

21213020012 is a deficient number, since it is larger than the sum of its proper divisors (17014355860).

21213020012 is a wasteful number, since it uses less digits than its factorization.

21213020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677449 (or 677447 counting only the distinct ones).

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

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

The spelling of 21213020012 in words is "twenty-one billion, two hundred thirteen million, twenty thousand, twelve".