21236331145 has 8 divisors (see below), whose sum is σ = 25513269120. Its totient is φ = 16969283760.

The previous prime is 21236331131. The next prime is 21236331157. The reversal of 21236331145 is 54113363212.

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

It is not a de Polignac number, because 21236331145 - 2¹⁹ = 21235806857 is a prime.

It is a super-2 number, since 2×21236331145² (a number of 21 digits) contains 22 as substring.

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, 2467921 + ... + 2476510.

It is an arithmetic number, because the mean of its divisors is an integer number (3189158640).

Almost surely, 2^21236331145 is an apocalyptic number.

It is an amenable number.

21236331145 is a deficient number, since it is larger than the sum of its proper divisors (4276937975).

21236331145 is an equidigital number, since it uses as much as digits as its factorization.

21236331145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4945295.

The product of its digits is 12960, while the sum is 31.

Adding to 21236331145 its reverse (54113363212), we get a palindrome (75349694357).

The spelling of 21236331145 in words is "twenty-one billion, two hundred thirty-six million, three hundred thirty-one thousand, one hundred forty-five".