1621013233 has 4 divisors (see below), whose sum is σ = 1852586560. Its totient is φ = 1389439908.

The previous prime is 1621013161. The next prime is 1621013239. The reversal of 1621013233 is 3323101261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3323101261 = 20849 ⋅159389.

It is a cyclic number.

It is not a de Polignac number, because 1621013233 - 2¹³ = 1621005041 is a prime.

It is a super-2 number, since 2×1621013233² = 5255367803122224578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621013239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115786653 + ... + 115786666.

It is an arithmetic number, because the mean of its divisors is an integer number (463146640).

Almost surely, 2^1621013233 is an apocalyptic number.

It is an amenable number.

1621013233 is a deficient number, since it is larger than the sum of its proper divisors (231573327).

1621013233 is an equidigital number, since it uses as much as digits as its factorization.

1621013233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231573326.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 1621013233 is about 40261.8086156099. The cubic root of 1621013233 is about 1174.7050976830.

Adding to 1621013233 its reverse (3323101261), we get a palindrome (4944114494).

The spelling of 1621013233 in words is "one billion, six hundred twenty-one million, thirteen thousand, two hundred thirty-three".