21901321598 has 8 divisors (see below), whose sum is σ = 35379058008. Its totient is φ = 10108302264.

The previous prime is 21901321597. The next prime is 21901321621. The reversal of 21901321598 is 89512310912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21901321597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421179236 + ... + 421179287.

It is an arithmetic number, because the mean of its divisors is an integer number (4422382251).

Almost surely, 2^21901321598 is an apocalyptic number.

21901321598 is a deficient number, since it is larger than the sum of its proper divisors (13477736410).

21901321598 is a wasteful number, since it uses less digits than its factorization.

21901321598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842358538.

The product of its (nonzero) digits is 38880, while the sum is 41.

The spelling of 21901321598 in words is "twenty-one billion, nine hundred one million, three hundred twenty-one thousand, five hundred ninety-eight".