21062671 has 16 divisors (see below), whose sum is σ = 25712640. Its totient is φ = 16863840.

The previous prime is 21062663. The next prime is 21062681. The reversal of 21062671 is 17626012.

It is not a de Polignac number, because 21062671 - 2³ = 21062663 is a prime.

It is a super-2 number, since 2×21062671² = 887272219308482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21062611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4620 + ... + 7966.

It is an arithmetic number, because the mean of its divisors is an integer number (1607040).

Almost surely, 2^21062671 is an apocalyptic number.

21062671 is a deficient number, since it is larger than the sum of its proper divisors (4649969).

21062671 is a wasteful number, since it uses less digits than its factorization.

21062671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21062671 is about 4589.4085675607. The cubic root of 21062671 is about 276.1665967176.

Adding to 21062671 its reverse (17626012), we get a palindrome (38688683).

The spelling of 21062671 in words is "twenty-one million, sixty-two thousand, six hundred seventy-one".