21050570 has 16 divisors (see below), whose sum is σ = 37968480. Its totient is φ = 8403024.

The previous prime is 21050569. The next prime is 21050591. The reversal of 21050570 is 7505012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3761 + ... + 7499.

It is an arithmetic number, because the mean of its divisors is an integer number (2373030).

Almost surely, 2^21050570 is an apocalyptic number.

21050570 is a deficient number, since it is larger than the sum of its proper divisors (16917910).

21050570 is a wasteful number, since it uses less digits than its factorization.

21050570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4309.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 21050570 is about 4588.0900165537. The cubic root of 21050570 is about 276.1136985170.

Adding to 21050570 its reverse (7505012), we get a palindrome (28555582).

The spelling of 21050570 in words is "twenty-one million, fifty thousand, five hundred seventy".