221045626 has 4 divisors (see below), whose sum is σ = 331568442. Its totient is φ = 110522812.

The previous prime is 221045621. The next prime is 221045633. The reversal of 221045626 is 626540122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 194574601 + 26471025 = 13949^2 + 5145^2 .

It is a super-2 number, since 2×221045626² = 97722337547463752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221045594 and 221045603.

It is not an unprimeable number, because it can be changed into a prime (221045621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55261405 + ... + 55261408.

Almost surely, 2^221045626 is an apocalyptic number.

221045626 is a deficient number, since it is larger than the sum of its proper divisors (110522816).

221045626 is a wasteful number, since it uses less digits than its factorization.

221045626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110522815.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 221045626 is about 14867.6032365678. The cubic root of 221045626 is about 604.6359634084.

Adding to 221045626 its reverse (626540122), we get a palindrome (847585748).

It can be divided in two parts, 22104 and 5626, that added together give a triangular number (27730 = T₂₃₅).

The spelling of 221045626 in words is "two hundred twenty-one million, forty-five thousand, six hundred twenty-six".