21012012006 has 32 divisors (see below), whose sum is σ = 43310762880. Its totient is φ = 6791891904.

The previous prime is 21012011989. The next prime is 21012012067. The reversal of 21012012006 is 60021021012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257095 + ... + 328818.

It is an arithmetic number, because the mean of its divisors is an integer number (1353461340).

Almost surely, 2^21012012006 is an apocalyptic number.

21012012006 is an abundant number, since it is smaller than the sum of its proper divisors (22298750874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012012006 is a wasteful number, since it uses less digits than its factorization.

21012012006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586100.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21012012006 its reverse (60021021012), we get a palindrome (81033033018).

The spelling of 21012012006 in words is "twenty-one billion, twelve million, twelve thousand, six".