21346232154 has 64 divisors (see below), whose sum is σ = 47741352960. Its totient is φ = 6356076480.

The previous prime is 21346232113. The next prime is 21346232177. The reversal of 21346232154 is 45123264312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 382524 + ... + 434760.

It is an arithmetic number, because the mean of its divisors is an integer number (745958640).

Almost surely, 2^21346232154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21346232154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23870676480).

21346232154 is an abundant number, since it is smaller than the sum of its proper divisors (26395120806).

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

21346232154 is a wasteful number, since it uses less digits than its factorization.

21346232154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52312 (or 52286 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

Adding to 21346232154 its reverse (45123264312), we get a palindrome (66469496466).

The spelling of 21346232154 in words is "twenty-one billion, three hundred forty-six million, two hundred thirty-two thousand, one hundred fifty-four".