21580606398 has 32 divisors (see below), whose sum is σ = 47041335936. Its totient is φ = 6560182368.

The previous prime is 21580606393. The next prime is 21580606423. The reversal of 21580606398 is 89360608512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21580606393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1660240 + ... + 1673187.

It is an arithmetic number, because the mean of its divisors is an integer number (1470041748).

Almost surely, 2^21580606398 is an apocalyptic number.

21580606398 is an abundant number, since it is smaller than the sum of its proper divisors (25460729538).

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

21580606398 is a wasteful number, since it uses less digits than its factorization.

21580606398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333528.

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 21580606398 in words is "twenty-one billion, five hundred eighty million, six hundred six thousand, three hundred ninety-eight".