21623300181806 has 4 divisors (see below), whose sum is σ = 32434950272712. Its totient is φ = 10811650090902.

The previous prime is 21623300181787. The next prime is 21623300181811. The reversal of 21623300181806 is 60818100332612.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21623300181806² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5405825045450 + ... + 5405825045453.

It is an arithmetic number, because the mean of its divisors is an integer number (8108737568178).

Almost surely, 2^{21623300181806} is an apocalyptic number.

21623300181806 is a deficient number, since it is larger than the sum of its proper divisors (10811650090906).

21623300181806 is a wasteful number, since it uses less digits than its factorization.

21623300181806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10811650090905.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 21623300181806 in words is "twenty-one trillion, six hundred twenty-three billion, three hundred million, one hundred eighty-one thousand, eight hundred six".