21512846699 has 2 divisors, whose sum is σ = 21512846700. Its totient is φ = 21512846698.

The previous prime is 21512846687. The next prime is 21512846713. The reversal of 21512846699 is 99664821512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21512846699 - 2¹⁶ = 21512781163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21512846699.

It is not a weakly prime, because it can be changed into another prime (21512836699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10756423349 + 10756423350.

It is an arithmetic number, because the mean of its divisors is an integer number (10756423350).

Almost surely, 2^21512846699 is an apocalyptic number.

21512846699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21512846699 is an equidigital number, since it uses as much as digits as its factorization.

21512846699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 53.

The spelling of 21512846699 in words is "twenty-one billion, five hundred twelve million, eight hundred forty-six thousand, six hundred ninety-nine".