21926481 has 8 divisors (see below), whose sum is σ = 30955104. Its totient is φ = 13757760.

The previous prime is 21926479. The next prime is 21926483. The reversal of 21926481 is 18462912.

It is an interprime number because it is at equal distance from previous prime (21926479) and next prime (21926483).

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

It is not a de Polignac number, because 21926481 - 2¹ = 21926479 is a prime.

It is a super-2 number, since 2×21926481² = 961541138086722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21926483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214915 + ... + 215016.

It is an arithmetic number, because the mean of its divisors is an integer number (3869388).

Almost surely, 2^21926481 is an apocalyptic number.

It is an amenable number.

21926481 is a deficient number, since it is larger than the sum of its proper divisors (9028623).

21926481 is a wasteful number, since it uses less digits than its factorization.

21926481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429951.

The product of its digits is 6912, while the sum is 33.

The square root of 21926481 is about 4682.5720496326. The cubic root of 21926481 is about 279.8914587801.

The spelling of 21926481 in words is "twenty-one million, nine hundred twenty-six thousand, four hundred eighty-one".