21662042254 has 8 divisors (see below), whose sum is σ = 33285577248. Its totient is φ = 10566849840.

The previous prime is 21662042239. The next prime is 21662042341. The reversal of 21662042254 is 45224026612.

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

It is a super-2 number, since 2×21662042254² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132085542 + ... + 132085705.

It is an arithmetic number, because the mean of its divisors is an integer number (4160697156).

Almost surely, 2^21662042254 is an apocalyptic number.

21662042254 is a deficient number, since it is larger than the sum of its proper divisors (11623534994).

21662042254 is a wasteful number, since it uses less digits than its factorization.

21662042254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264171290.

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 21662042254 its reverse (45224026612), we get a palindrome (66886068866).

The spelling of 21662042254 in words is "twenty-one billion, six hundred sixty-two million, forty-two thousand, two hundred fifty-four".