21598440934 has 8 divisors (see below), whose sum is σ = 37025898768. Its totient is φ = 9256474680.

The previous prime is 21598440923. The next prime is 21598440937. The reversal of 21598440934 is 43904489512.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21598440937) 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, 771372877 + ... + 771372904.

It is an arithmetic number, because the mean of its divisors is an integer number (4628237346).

Almost surely, 2^21598440934 is an apocalyptic number.

21598440934 is a deficient number, since it is larger than the sum of its proper divisors (15427457834).

21598440934 is a wasteful number, since it uses less digits than its factorization.

21598440934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542745790.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 21598440934 in words is "twenty-one billion, five hundred ninety-eight million, four hundred forty thousand, nine hundred thirty-four".