21212832571 has 16 divisors (see below), whose sum is σ = 24347142144. Its totient is φ = 18104590944.

The previous prime is 21212832569. The next prime is 21212832581. The reversal of 21212832571 is 17523821212.

It is a cyclic number.

It is not a de Polignac number, because 21212832571 - 2¹ = 21212832569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212832521) 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, 3997506 + ... + 4002808.

It is an arithmetic number, because the mean of its divisors is an integer number (1521696384).

Almost surely, 2^21212832571 is an apocalyptic number.

21212832571 is a deficient number, since it is larger than the sum of its proper divisors (3134309573).

21212832571 is a wasteful number, since it uses less digits than its factorization.

21212832571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7650.

The product of its digits is 13440, while the sum is 34.

The spelling of 21212832571 in words is "twenty-one billion, two hundred twelve million, eight hundred thirty-two thousand, five hundred seventy-one".