21439010 has 8 divisors (see below), whose sum is σ = 38590236. Its totient is φ = 8575600.

The previous prime is 21438961. The next prime is 21439079. The reversal of 21439010 is 1093412.

It can be written as a sum of positive squares in 2 ways, for example, as 19333609 + 2105401 = 4397^2 + 1451^2 .

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

It is a super-2 number, since 2×21439010² = 919262299560200, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071941 + ... + 1071960.

Almost surely, 2^21439010 is an apocalyptic number.

21439010 is a deficient number, since it is larger than the sum of its proper divisors (17151226).

21439010 is a wasteful number, since it uses less digits than its factorization.

21439010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143908.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21439010 is about 4630.2278561643. The cubic root of 21439010 is about 277.8017063239.

The spelling of 21439010 in words is "twenty-one million, four hundred thirty-nine thousand, ten".