21819437854 has 16 divisors (see below), whose sum is σ = 35563092480. Its totient is φ = 10002118680.

The previous prime is 21819437839. The next prime is 21819437863. The reversal of 21819437854 is 45873491812.

It is a congruent number.

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, 9260044 + ... + 9262399.

It is an arithmetic number, because the mean of its divisors is an integer number (2222693280).

Almost surely, 2^21819437854 is an apocalyptic number.

21819437854 is a deficient number, since it is larger than the sum of its proper divisors (13743654626).

21819437854 is a wasteful number, since it uses less digits than its factorization.

21819437854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18522495.

The product of its digits is 1935360, while the sum is 52.

The spelling of 21819437854 in words is "twenty-one billion, eight hundred nineteen million, four hundred thirty-seven thousand, eight hundred fifty-four".