21349867858 has 8 divisors (see below), whose sum is σ = 34936147440. Its totient is φ = 9704485380.

The previous prime is 21349867841. The next prime is 21349867859. The reversal of 21349867858 is 85876894312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21349867796 and 21349867805.

It is not an unprimeable number, because it can be changed into a prime (21349867859) 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, 485224248 + ... + 485224291.

It is an arithmetic number, because the mean of its divisors is an integer number (4367018430).

Almost surely, 2^21349867858 is an apocalyptic number.

21349867858 is a deficient number, since it is larger than the sum of its proper divisors (13586279582).

21349867858 is a wasteful number, since it uses less digits than its factorization.

21349867858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970448552.

The product of its digits is 23224320, while the sum is 61.

The spelling of 21349867858 in words is "twenty-one billion, three hundred forty-nine million, eight hundred sixty-seven thousand, eight hundred fifty-eight".