21212310099 has 16 divisors (see below), whose sum is σ = 30037288320. Its totient is φ = 13269463680.

The previous prime is 21212310037. The next prime is 21212310103. The reversal of 21212310099 is 99001321212.

It is not a de Polignac number, because 21212310099 - 2²⁵ = 21178755667 is a prime.

It is a super-2 number, since 2×21212310099² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212310019) 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, 611409 + ... + 645170.

It is an arithmetic number, because the mean of its divisors is an integer number (1877330520).

Almost surely, 2^21212310099 is an apocalyptic number.

21212310099 is a deficient number, since it is larger than the sum of its proper divisors (8824978221).

21212310099 is a wasteful number, since it uses less digits than its factorization.

21212310099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256930.

The product of its (nonzero) digits is 1944, while the sum is 30.

It can be divided in two parts, 212123 and 10099, that added together give a palindrome (222222).

The spelling of 21212310099 in words is "twenty-one billion, two hundred twelve million, three hundred ten thousand, ninety-nine".