21161003577 has 8 divisors (see below), whose sum is σ = 32245338816. Its totient is φ = 12092002032.

The previous prime is 21161003573. The next prime is 21161003653. The reversal of 21161003577 is 77530016112.

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

It is not a de Polignac number, because 21161003577 - 2² = 21161003573 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21161003573) 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, 503833398 + ... + 503833439.

It is an arithmetic number, because the mean of its divisors is an integer number (4030667352).

Almost surely, 2^21161003577 is an apocalyptic number.

It is an amenable number.

21161003577 is a deficient number, since it is larger than the sum of its proper divisors (11084335239).

21161003577 is a wasteful number, since it uses less digits than its factorization.

21161003577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007666847.

The product of its (nonzero) digits is 8820, while the sum is 33.

Adding to 21161003577 its reverse (77530016112), we get a palindrome (98691019689).

The spelling of 21161003577 in words is "twenty-one billion, one hundred sixty-one million, three thousand, five hundred seventy-seven".