21088462 has 4 divisors (see below), whose sum is σ = 31632696. Its totient is φ = 10544230.

The previous prime is 21088453. The next prime is 21088469. The reversal of 21088462 is 26488012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21088469) 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 as a sum of consecutive naturals, namely, 5272114 + ... + 5272117.

It is an arithmetic number, because the mean of its divisors is an integer number (7908174).

Almost surely, 2^21088462 is an apocalyptic number.

21088462 is a deficient number, since it is larger than the sum of its proper divisors (10544234).

21088462 is a wasteful number, since it uses less digits than its factorization.

21088462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10544233.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 21088462 is about 4592.2175471116. The cubic root of 21088462 is about 276.2792716879.

The spelling of 21088462 in words is "twenty-one million, eighty-eight thousand, four hundred sixty-two".