1621105233 has 16 divisors (see below), whose sum is σ = 2390275776. Its totient is φ = 969027840.

The previous prime is 1621105229. The next prime is 1621105271. The reversal of 1621105233 is 3325011261.

It is not a de Polignac number, because 1621105233 - 2² = 1621105229 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1621105033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334060 + ... + 338877.

It is an arithmetic number, because the mean of its divisors is an integer number (149392236).

Almost surely, 2^1621105233 is an apocalyptic number.

It is an amenable number.

1621105233 is a deficient number, since it is larger than the sum of its proper divisors (769170543).

1621105233 is a wasteful number, since it uses less digits than its factorization.

1621105233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673024.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1621105233 is about 40262.9511213473. The cubic root of 1621105233 is about 1174.7273205788.

Adding to 1621105233 its reverse (3325011261), we get a palindrome (4946116494).

The spelling of 1621105233 in words is "one billion, six hundred twenty-one million, one hundred five thousand, two hundred thirty-three".