21146534244 has 120 divisors (see below), whose sum is σ = 62386632000. Its totient is φ = 6187043520.

The previous prime is 21146534237. The next prime is 21146534251. The reversal of 21146534244 is 44243564112.

21146534244 is a `hidden beast` number, since 2 + 114 + 6 + 534 + 2 + 4 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (21146534237) and next prime (21146534251).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21146534199 and 21146534208.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1057 + ... + 205655.

It is an arithmetic number, because the mean of its divisors is an integer number (519888600).

Almost surely, 2^21146534244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21146534244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31193316000).

21146534244 is an abundant number, since it is smaller than the sum of its proper divisors (41240097756).

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

21146534244 is a wasteful number, since it uses less digits than its factorization.

21146534244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204655 (or 204644 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The spelling of 21146534244 in words is "twenty-one billion, one hundred forty-six million, five hundred thirty-four thousand, two hundred forty-four".