21063590 has 32 divisors (see below), whose sum is σ = 40608000. Its totient is φ = 7842528.

The previous prime is 21063569. The next prime is 21063673. The reversal of 21063590 is 9536012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10271 + ... + 12149.

It is an arithmetic number, because the mean of its divisors is an integer number (1269000).

Almost surely, 2^21063590 is an apocalyptic number.

21063590 is a deficient number, since it is larger than the sum of its proper divisors (19544410).

21063590 is a wasteful number, since it uses less digits than its factorization.

21063590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1964.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 21063590 is about 4589.5086883020. The cubic root of 21063590 is about 276.1706131979.

The spelling of 21063590 in words is "twenty-one million, sixty-three thousand, five hundred ninety".