221440654 has 4 divisors (see below), whose sum is σ = 332160984. Its totient is φ = 110720326.

The previous prime is 221440643. The next prime is 221440663. The reversal of 221440654 is 456044122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 456044122 = 2 ⋅228022061.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55360162 + ... + 55360165.

It is an arithmetic number, because the mean of its divisors is an integer number (83040246).

Almost surely, 2^221440654 is an apocalyptic number.

221440654 is a deficient number, since it is larger than the sum of its proper divisors (110720330).

221440654 is a wasteful number, since it uses less digits than its factorization.

221440654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110720329.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 221440654 is about 14880.8821647105. The cubic root of 221440654 is about 604.9959283017.

Adding to 221440654 its reverse (456044122), we get a palindrome (677484776).

It can be divided in two parts, 2214406 and 54, that added together give a triangular number (2214460 = T₂₁₀₄).

The spelling of 221440654 in words is "two hundred twenty-one million, four hundred forty thousand, six hundred fifty-four".