21352052111 has 8 divisors (see below), whose sum is σ = 23787432480. Its totient is φ = 19029945312.

The previous prime is 21352052083. The next prime is 21352052149. The reversal of 21352052111 is 11125025312.

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

It is a cyclic number.

It is not a de Polignac number, because 21352052111 - 2²² = 21347857807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352052171) 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, 28317995 + ... + 28318748.

It is an arithmetic number, because the mean of its divisors is an integer number (2973429060).

Almost surely, 2^21352052111 is an apocalyptic number.

21352052111 is a deficient number, since it is larger than the sum of its proper divisors (2435380369).

21352052111 is a wasteful number, since it uses less digits than its factorization.

21352052111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56636785.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21352052111 its reverse (11125025312), we get a palindrome (32477077423).

The spelling of 21352052111 in words is "twenty-one billion, three hundred fifty-two million, fifty-two thousand, one hundred eleven".