21160061 has 12 divisors (see below), whose sum is σ = 23166612. Its totient is φ = 19211904.

The previous prime is 21160043. The next prime is 21160079. The reversal of 21160061 is 16006112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21160043) and next prime (21160079).

It can be written as a sum of positive squares in 6 ways, for example, as 55225 + 21104836 = 235^2 + 4594^2 .

It is not a de Polignac number, because 21160061 - 2¹⁰ = 21159037 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 (21160001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154385 + ... + 154521.

It is an arithmetic number, because the mean of its divisors is an integer number (1930551).

Almost surely, 2^21160061 is an apocalyptic number.

It is an amenable number.

21160061 is a deficient number, since it is larger than the sum of its proper divisors (2006551).

21160061 is a wasteful number, since it uses less digits than its factorization.

21160061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 21160061 is about 4600.0066304300. The cubic root of 21160061 is about 276.5915905710.

Adding to 21160061 its reverse (16006112), we get a palindrome (37166173).

The spelling of 21160061 in words is "twenty-one million, one hundred sixty thousand, sixty-one".