21111222099 has 16 divisors (see below), whose sum is σ = 30715271424. Its totient is φ = 12791330400.

The previous prime is 21111222091. The next prime is 21111222113. The reversal of 21111222099 is 99022211112.

It is not a de Polignac number, because 21111222099 - 2³ = 21111222091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111222091) 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, 47277 + ... + 210849.

It is an arithmetic number, because the mean of its divisors is an integer number (1919704464).

Almost surely, 2^21111222099 is an apocalyptic number.

21111222099 is a deficient number, since it is larger than the sum of its proper divisors (9604049325).

21111222099 is a wasteful number, since it uses less digits than its factorization.

21111222099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167498.

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 21111222099 in words is "twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, ninety-nine".