21221010019999 has 16 divisors (see below), whose sum is σ = 21470591024064. Its totient is φ = 20972220192000.

The previous prime is 21221010019997. The next prime is 21221010020029. The reversal of 21221010019999 is 99991001012212.

It is a cyclic number.

It is not a de Polignac number, because 21221010019999 - 2¹ = 21221010019997 is a prime.

It is a super-3 number, since 3×21221010019999³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221010019991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260810307 + ... + 260891659.

It is an arithmetic number, because the mean of its divisors is an integer number (1341911939004).

Almost surely, 2^{21221010019999} is an apocalyptic number.

21221010019999 is a deficient number, since it is larger than the sum of its proper divisors (249581004065).

21221010019999 is a wasteful number, since it uses less digits than its factorization.

21221010019999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86178.

The product of its (nonzero) digits is 52488, while the sum is 46.

The spelling of 21221010019999 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, nineteen thousand, nine hundred ninety-nine".