21071030057 has 16 divisors (see below), whose sum is σ = 27117809664. Its totient is φ = 15889338000.

The previous prime is 21071030051. The next prime is 21071030059. The reversal of 21071030057 is 75003017012.

It is a cyclic number.

It is not a de Polignac number, because 21071030057 - 2¹² = 21071025961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21071030051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4411319 + ... + 4416092.

It is an arithmetic number, because the mean of its divisors is an integer number (1694863104).

Almost surely, 2^21071030057 is an apocalyptic number.

It is an amenable number.

21071030057 is a deficient number, since it is larger than the sum of its proper divisors (6046779607).

21071030057 is a wasteful number, since it uses less digits than its factorization.

21071030057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8827460.

The product of its (nonzero) digits is 1470, while the sum is 26.

Adding to 21071030057 its reverse (75003017012), we get a palindrome (96074047069).

The spelling of 21071030057 in words is "twenty-one billion, seventy-one million, thirty thousand, fifty-seven".