21491162 has 32 divisors (see below), whose sum is σ = 42560640. Its totient is φ = 7879680.

The previous prime is 21491149. The next prime is 21491189. The reversal of 21491162 is 26119412.

It is a super-2 number, since 2×21491162² = 923740088220488, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1487 + ... + 6722.

It is an arithmetic number, because the mean of its divisors is an integer number (1330020).

Almost surely, 2^21491162 is an apocalyptic number.

21491162 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21491162 is a deficient number, since it is larger than the sum of its proper divisors (21069478).

21491162 is a wasteful number, since it uses less digits than its factorization.

21491162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8246.

The product of its digits is 864, while the sum is 26.

The square root of 21491162 is about 4635.8561237381. The cubic root of 21491162 is about 278.0267817478.

The spelling of 21491162 in words is "twenty-one million, four hundred ninety-one thousand, one hundred sixty-two".