21071898404 has 12 divisors (see below), whose sum is σ = 36982095024. Its totient is φ = 10505585544.

The previous prime is 21071898373. The next prime is 21071898409. The reversal of 21071898404 is 40489817012.

It is not an unprimeable number, because it can be changed into a prime (21071898409) 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, 7589354 + ... + 7592129.

It is an arithmetic number, because the mean of its divisors is an integer number (3081841252).

Almost surely, 2^21071898404 is an apocalyptic number.

It is an amenable number.

21071898404 is a deficient number, since it is larger than the sum of its proper divisors (15910196620).

21071898404 is a wasteful number, since it uses less digits than its factorization.

21071898404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15181834 (or 15181832 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 21071898404 in words is "twenty-one billion, seventy-one million, eight hundred ninety-eight thousand, four hundred four".