21107618242 has 16 divisors (see below), whose sum is σ = 31912875072. Its totient is φ = 10470255760.

The previous prime is 21107618221. The next prime is 21107618281. The reversal of 21107618242 is 24281670112.

It is a super-2 number, since 2×21107618242² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21107618198 and 21107618207.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96267 + ... + 226897.

It is an arithmetic number, because the mean of its divisors is an integer number (1994554692).

Almost surely, 2^21107618242 is an apocalyptic number.

21107618242 is a deficient number, since it is larger than the sum of its proper divisors (10805256830).

21107618242 is a wasteful number, since it uses less digits than its factorization.

21107618242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131273.

The product of its (nonzero) digits is 10752, while the sum is 34.

The spelling of 21107618242 in words is "twenty-one billion, one hundred seven million, six hundred eighteen thousand, two hundred forty-two".