21012300212 has 12 divisors (see below), whose sum is σ = 36772569540. Its totient is φ = 10505851776.

The previous prime is 21012300181. The next prime is 21012300251. The reversal of 21012300212 is 21200321012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9001455376 + 12010844836 = 94876^2 + 109594^2 .

It is a congruent 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, 181868 + ... + 274044.

It is an arithmetic number, because the mean of its divisors is an integer number (3064380795).

Almost surely, 2^21012300212 is an apocalyptic number.

It is an amenable number.

21012300212 is a deficient number, since it is larger than the sum of its proper divisors (15760269328).

21012300212 is a wasteful number, since it uses less digits than its factorization.

21012300212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149170 (or 149168 counting only the distinct ones).

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

Adding to 21012300212 its reverse (21200321012), we get a palindrome (42212621224).

The spelling of 21012300212 in words is "twenty-one billion, twelve million, three hundred thousand, two hundred twelve".