21061046 has 8 divisors (see below), whose sum is σ = 31670040. Its totient is φ = 10504368.

The previous prime is 21061037. The next prime is 21061057. The reversal of 21061046 is 64016012.

It is a happy number.

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

It is a super-2 number, since 2×21061046² = 887135317228232, which 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, 12056 + ... + 13691.

It is an arithmetic number, because the mean of its divisors is an integer number (3958755).

Almost surely, 2^21061046 is an apocalyptic number.

21061046 is a deficient number, since it is larger than the sum of its proper divisors (10608994).

21061046 is a wasteful number, since it uses less digits than its factorization.

21061046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26158.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21061046 is about 4589.2315260836. The cubic root of 21061046 is about 276.1594943854.

Adding to 21061046 its reverse (64016012), we get a palindrome (85077058).

The spelling of 21061046 in words is "twenty-one million, sixty-one thousand, forty-six".