18721135010 has 8 divisors (see below), whose sum is σ = 33698043036. Its totient is φ = 7488454000.

The previous prime is 18721135003. The next prime is 18721135021. The reversal of 18721135010 is 1053112781.

It can be written as a sum of positive squares in 2 ways, for example, as 16892460841 + 1828674169 = 129971^2 + 42763^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 936056741 + ... + 936056760.

Almost surely, 2^18721135010 is an apocalyptic number.

18721135010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18721135010 is a deficient number, since it is larger than the sum of its proper divisors (14976908026).

18721135010 is a wasteful number, since it uses less digits than its factorization.

18721135010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872113508.

The product of its (nonzero) digits is 1680, while the sum is 29.

Adding to 18721135010 its reverse (1053112781), we get a palindrome (19774247791).

The spelling of 18721135010 in words is "eighteen billion, seven hundred twenty-one million, one hundred thirty-five thousand, ten".