21101333154 has 64 divisors (see below), whose sum is σ = 47180897280. Its totient is φ = 6236233920.

The previous prime is 21101333153. The next prime is 21101333161. The reversal of 21101333154 is 45133310112.

It is not an unprimeable number, because it can be changed into a prime (21101333153) 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, 2006899 + ... + 2017385.

It is an arithmetic number, because the mean of its divisors is an integer number (737201520).

Almost surely, 2^21101333154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21101333154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23590448640).

21101333154 is an abundant number, since it is smaller than the sum of its proper divisors (26079564126).

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

21101333154 is a wasteful number, since it uses less digits than its factorization.

21101333154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11255.

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 21101333154 its reverse (45133310112), we get a palindrome (66234643266).

The spelling of 21101333154 in words is "twenty-one billion, one hundred one million, three hundred thirty-three thousand, one hundred fifty-four".