20998911111 has 8 divisors (see below), whose sum is σ = 28275761904. Its totient is φ = 13860667200.

The previous prime is 20998911077. The next prime is 20998911119. The reversal of 20998911111 is 11111989902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20998911111 - 2⁶ = 20998911047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20998911119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34651366 + ... + 34651971.

It is an arithmetic number, because the mean of its divisors is an integer number (3534470238).

Almost surely, 2^20998911111 is an apocalyptic number.

20998911111 is a deficient number, since it is larger than the sum of its proper divisors (7276850793).

20998911111 is a wasteful number, since it uses less digits than its factorization.

20998911111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69303441.

The product of its (nonzero) digits is 11664, while the sum is 42.

The spelling of 20998911111 in words is "twenty billion, nine hundred ninety-eight million, nine hundred eleven thousand, one hundred eleven".