21010212099 has 12 divisors (see below), whose sum is σ = 30541386096. Its totient is φ = 13917591792.

The previous prime is 21010212073. The next prime is 21010212133. The reversal of 21010212099 is 99021201012.

It is not a de Polignac number, because 21010212099 - 2¹⁵ = 21010179331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21010212049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7433199 + ... + 7436024.

It is an arithmetic number, because the mean of its divisors is an integer number (2545115508).

Almost surely, 2^21010212099 is an apocalyptic number.

21010212099 is a deficient number, since it is larger than the sum of its proper divisors (9531173997).

21010212099 is a wasteful number, since it uses less digits than its factorization.

21010212099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14869386 (or 14869383 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 21010212099 in words is "twenty-one billion, ten million, two hundred twelve thousand, ninety-nine".