21060654 has 16 divisors (see below), whose sum is σ = 44599248. Its totient is φ = 6607232.

The previous prime is 21060649. The next prime is 21060661. The reversal of 21060654 is 45606012.

It is a super-2 number, since 2×21060654² = 887102293815432, 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103137 + ... + 103340.

It is an arithmetic number, because the mean of its divisors is an integer number (2787453).

Almost surely, 2^21060654 is an apocalyptic number.

21060654 is an abundant number, since it is smaller than the sum of its proper divisors (23538594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21060654 is a wasteful number, since it uses less digits than its factorization.

21060654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206499.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21060654 is about 4589.1888172094. The cubic root of 21060654 is about 276.1577810296.

Adding to 21060654 its reverse (45606012), we get a palindrome (66666666).

The spelling of 21060654 in words is "twenty-one million, sixty thousand, six hundred fifty-four".