21121143535 has 8 divisors (see below), whose sum is σ = 25395763680. Its totient is φ = 16863320544.

The previous prime is 21121143517. The next prime is 21121143557. The reversal of 21121143535 is 53534112112.

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 21121143535 - 2¹⁵ = 21121110767 is a prime.

It is a super-2 number, since 2×21121143535² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4196520 + ... + 4201549.

It is an arithmetic number, because the mean of its divisors is an integer number (3174470460).

Almost surely, 2^21121143535 is an apocalyptic number.

21121143535 is a deficient number, since it is larger than the sum of its proper divisors (4274620145).

21121143535 is an equidigital number, since it uses as much as digits as its factorization.

21121143535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8398577.

The product of its digits is 3600, while the sum is 28.

Adding to 21121143535 its reverse (53534112112), we get a palindrome (74655255647).

The spelling of 21121143535 in words is "twenty-one billion, one hundred twenty-one million, one hundred forty-three thousand, five hundred thirty-five".