21082708 has 6 divisors (see below), whose sum is σ = 36894746. Its totient is φ = 10541352.

The previous prime is 21082687. The next prime is 21082729. The reversal of 21082708 is 80728012.

It is an interprime number because it is at equal distance from previous prime (21082687) and next prime (21082729).

It can be written as a sum of positive squares in only one way, i.e., 18766224 + 2316484 = 4332^2 + 1522^2 .

It is a super-2 number, since 2×21082708² = 888961153226528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2635335 + ... + 2635342.

Almost surely, 2^21082708 is an apocalyptic number.

It is an amenable number.

21082708 is a deficient number, since it is larger than the sum of its proper divisors (15812038).

21082708 is a wasteful number, since it uses less digits than its factorization.

21082708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270681 (or 5270679 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 21082708 is about 4591.5910096610. The cubic root of 21082708 is about 276.2541417450.

The spelling of 21082708 in words is "twenty-one million, eighty-two thousand, seven hundred eight".