21571034 has 4 divisors (see below), whose sum is σ = 32356554. Its totient is φ = 10785516.

The previous prime is 21571001. The next prime is 21571051. The reversal of 21571034 is 43017512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14025025 + 7546009 = 3745^2 + 2747^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5392757 + ... + 5392760.

Almost surely, 2^21571034 is an apocalyptic number.

21571034 is a deficient number, since it is larger than the sum of its proper divisors (10785520).

21571034 is a wasteful number, since it uses less digits than its factorization.

21571034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10785519.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21571034 is about 4644.4627245786. The cubic root of 21571034 is about 278.3707851962.

Adding to 21571034 its reverse (43017512), we get a palindrome (64588546).

The spelling of 21571034 in words is "twenty-one million, five hundred seventy-one thousand, thirty-four".