20211101998 has 4 divisors (see below), whose sum is σ = 30316653000. Its totient is φ = 10105550998.

The previous prime is 20211101947. The next prime is 20211102011. The reversal of 20211101998 is 89910111202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89910111202 = 2 ⋅44955055601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5052775498 + ... + 5052775501.

It is an arithmetic number, because the mean of its divisors is an integer number (7579163250).

Almost surely, 2^20211101998 is an apocalyptic number.

20211101998 is a deficient number, since it is larger than the sum of its proper divisors (10105551002).

20211101998 is a wasteful number, since it uses less digits than its factorization.

20211101998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10105551001.

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 20211101998 in words is "twenty billion, two hundred eleven million, one hundred one thousand, nine hundred ninety-eight".