21027061 has 8 divisors (see below), whose sum is σ = 23372064. Its totient is φ = 18754320.

The previous prime is 21027049. The next prime is 21027067. The reversal of 21027061 is 16072012.

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

It is a cyclic number.

It is not a de Polignac number, because 21027061 - 2⁷ = 21026933 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 (21027067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17451 + ... + 18616.

It is an arithmetic number, because the mean of its divisors is an integer number (2921508).

Almost surely, 2^21027061 is an apocalyptic number.

It is an amenable number.

21027061 is a deficient number, since it is larger than the sum of its proper divisors (2345003).

21027061 is a wasteful number, since it uses less digits than its factorization.

21027061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36131.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21027061 is about 4585.5273415388. The cubic root of 21027061 is about 276.0108735127.

Adding to 21027061 its reverse (16072012), we get a palindrome (37099073).

The spelling of 21027061 in words is "twenty-one million, twenty-seven thousand, sixty-one".