21541403034 has 128 divisors (see below), whose sum is σ = 51227769600. Its totient is φ = 6698972160.

The previous prime is 21541403033. The next prime is 21541403041. The reversal of 21541403034 is 43030414512.

It is a happy number.

21541403034 is a `hidden beast` number, since 21 + 541 + 40 + 30 + 34 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21541402989 and 21541403007.

It is not an unprimeable number, because it can be changed into a prime (21541403033) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4830934 + ... + 4835390.

It is an arithmetic number, because the mean of its divisors is an integer number (400216950).

Almost surely, 2^21541403034 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21541403034, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25613884800).

21541403034 is an abundant number, since it is smaller than the sum of its proper divisors (29686366566).

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

21541403034 is a wasteful number, since it uses less digits than its factorization.

21541403034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4605 (or 4599 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21541403034 its reverse (43030414512), we get a palindrome (64571817546).

The spelling of 21541403034 in words is "twenty-one billion, five hundred forty-one million, four hundred three thousand, thirty-four".