21046245212 has 6 divisors (see below), whose sum is σ = 36830929128. Its totient is φ = 10523122604.

The previous prime is 21046245167. The next prime is 21046245257. The reversal of 21046245212 is 21254264012.

It is an interprime number because it is at equal distance from previous prime (21046245167) and next prime (21046245257).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630780648 + ... + 2630780655.

It is an arithmetic number, because the mean of its divisors is an integer number (6138488188).

Almost surely, 2^21046245212 is an apocalyptic number.

It is an amenable number.

21046245212 is a deficient number, since it is larger than the sum of its proper divisors (15784683916).

21046245212 is a wasteful number, since it uses less digits than its factorization.

21046245212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5261561307 (or 5261561305 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The spelling of 21046245212 in words is "twenty-one billion, forty-six million, two hundred forty-five thousand, two hundred twelve".