21335142243 has 8 divisors (see below), whose sum is σ = 29140682256. Its totient is φ = 13876515200.

The previous prime is 21335142229. The next prime is 21335142251. The reversal of 21335142243 is 34224153312.

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 21335142243 - 2¹² = 21335138147 is a prime.

It is a super-3 number, since 3×21335142243³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21335142243.

It is not an unprimeable number, because it can be changed into a prime (21335142203) 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, 86728098 + ... + 86728343.

It is an arithmetic number, because the mean of its divisors is an integer number (3642585282).

Almost surely, 2^21335142243 is an apocalyptic number.

21335142243 is a deficient number, since it is larger than the sum of its proper divisors (7805540013).

21335142243 is a wasteful number, since it uses less digits than its factorization.

21335142243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173456485.

The product of its digits is 17280, while the sum is 30.

Adding to 21335142243 its reverse (34224153312), we get a palindrome (55559295555).

The spelling of 21335142243 in words is "twenty-one billion, three hundred thirty-five million, one hundred forty-two thousand, two hundred forty-three".