21060061 has 16 divisors (see below), whose sum is σ = 24027840. Its totient is φ = 18282880.

The previous prime is 21060049. The next prime is 21060073. The reversal of 21060061 is 16006012.

It is an interprime number because it is at equal distance from previous prime (21060049) and next prime (21060073).

It is not a de Polignac number, because 21060061 - 2⁷ = 21059933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21060001) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 33825 + ... + 34441.

It is an arithmetic number, because the mean of its divisors is an integer number (1501740).

Almost surely, 2^21060061 is an apocalyptic number.

It is an amenable number.

21060061 is a deficient number, since it is larger than the sum of its proper divisors (2967779).

21060061 is a wasteful number, since it uses less digits than its factorization.

21060061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 21060061 is about 4589.1242083866. The cubic root of 21060061 is about 276.1551891015.

Adding to 21060061 its reverse (16006012), we get a palindrome (37066073).

The spelling of 21060061 in words is "twenty-one million, sixty thousand, sixty-one".