21165839054 has 8 divisors (see below), whose sum is σ = 31749417480. Its totient is φ = 10582699896.

The previous prime is 21165839053. The next prime is 21165839099. The reversal of 21165839054 is 45093856112.

It is a happy number.

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

It is a super-2 number, since 2×21165839054² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21165838996 and 21165839014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21165839053) 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, 68657 + ... + 216899.

It is an arithmetic number, because the mean of its divisors is an integer number (3968677185).

Almost surely, 2^21165839054 is an apocalyptic number.

21165839054 is a deficient number, since it is larger than the sum of its proper divisors (10583578426).

21165839054 is a wasteful number, since it uses less digits than its factorization.

21165839054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219634.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 21165839054 in words is "twenty-one billion, one hundred sixty-five million, eight hundred thirty-nine thousand, fifty-four".