21888058 has 4 divisors (see below), whose sum is σ = 32832090. Its totient is φ = 10944028.

The previous prime is 21888023. The next prime is 21888071. The reversal of 21888058 is 85088812.

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

It can be written as a sum of positive squares in only one way, i.e., 20820969 + 1067089 = 4563^2 + 1033^2 .

It is a super-3 number, since 3×21888058³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21888058.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5472013 + ... + 5472016.

Almost surely, 2^21888058 is an apocalyptic number.

21888058 is a deficient number, since it is larger than the sum of its proper divisors (10944032).

21888058 is a wasteful number, since it uses less digits than its factorization.

21888058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10944031.

The product of its (nonzero) digits is 40960, while the sum is 40.

The square root of 21888058 is about 4678.4674841234. The cubic root of 21888058 is about 279.7278733661.

The spelling of 21888058 in words is "twenty-one million, eight hundred eighty-eight thousand, fifty-eight".