21101301198 has 64 divisors (see below), whose sum is σ = 47803173120. Its totient is φ = 6897993696.

The previous prime is 21101301197. The next prime is 21101301209. The reversal of 21101301198 is 89110310112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101301197) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 808440 + ... + 834132.

It is an arithmetic number, because the mean of its divisors is an integer number (746924580).

Almost surely, 2^21101301198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21101301198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23901586560).

21101301198 is an abundant number, since it is smaller than the sum of its proper divisors (26701871922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21101301198 is a wasteful number, since it uses less digits than its factorization.

21101301198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25998 (or 25992 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The spelling of 21101301198 in words is "twenty-one billion, one hundred one million, three hundred one thousand, one hundred ninety-eight".