21034325561 has 8 divisors (see below), whose sum is σ = 21717984000. Its totient is φ = 20350987920.

The previous prime is 21034325503. The next prime is 21034325579. The reversal of 21034325561 is 16552343012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21034325561 is a prime.

It is a super-2 number, since 2×21034325561² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034328561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56810 + ... + 212828.

It is an arithmetic number, because the mean of its divisors is an integer number (2714748000).

Almost surely, 2^21034325561 is an apocalyptic number.

It is an amenable number.

21034325561 is a deficient number, since it is larger than the sum of its proper divisors (683658439).

21034325561 is a wasteful number, since it uses less digits than its factorization.

21034325561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160399.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 21034325561 its reverse (16552343012), we get a palindrome (37586668573).

The spelling of 21034325561 in words is "twenty-one billion, thirty-four million, three hundred twenty-five thousand, five hundred sixty-one".