21034340466 has 16 divisors (see below), whose sum is σ = 43897754304. Its totient is φ = 6706601264.

The previous prime is 21034340449. The next prime is 21034340471. The reversal of 21034340466 is 66404343012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76211241 + ... + 76211516.

It is an arithmetic number, because the mean of its divisors is an integer number (2743609644).

Almost surely, 2^21034340466 is an apocalyptic number.

21034340466 is an abundant number, since it is smaller than the sum of its proper divisors (22863413838).

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

21034340466 is a wasteful number, since it uses less digits than its factorization.

21034340466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152422785.

The product of its (nonzero) digits is 41472, while the sum is 33.

Adding to 21034340466 its reverse (66404343012), we get a palindrome (87438683478).

The spelling of 21034340466 in words is "twenty-one billion, thirty-four million, three hundred forty thousand, four hundred sixty-six".