21069130 has 16 divisors (see below), whose sum is σ = 38039400. Its totient is φ = 8402112.

The previous prime is 21069107. The next prime is 21069131. The reversal of 21069130 is 3196012.

It can be written as a sum of positive squares in 4 ways, for example, as 16136289 + 4932841 = 4017^2 + 2221^2 .

It is not an unprimeable number, because it can be changed into a prime (21069131) 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, 472 + ... + 6508.

Almost surely, 2^21069130 is an apocalyptic number.

21069130 is a deficient number, since it is larger than the sum of its proper divisors (16970270).

21069130 is a wasteful number, since it uses less digits than its factorization.

21069130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 21069130 is about 4590.1121990644. The cubic root of 21069130 is about 276.1948232381.

It can be divided in two parts, 21069 and 130, that multiplied together give a triangular number (2738970 = T₂₃₄₀).

The spelling of 21069130 in words is "twenty-one million, sixty-nine thousand, one hundred thirty".