61282221 has 32 divisors (see below), whose sum is σ = 109713408. Its totient is φ = 29384640.

The previous prime is 61282211. The next prime is 61282237. The reversal of 61282221 is 12228216.

It is not a de Polignac number, because 61282221 - 2⁶ = 61282157 is a prime.

It is a super-2 number, since 2×61282221² = 7511021221385682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61282191 and 61282200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61282211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7201 + ... + 13206.

It is an arithmetic number, because the mean of its divisors is an integer number (3428544).

Almost surely, 2^61282221 is an apocalyptic number.

It is an amenable number.

61282221 is a deficient number, since it is larger than the sum of its proper divisors (48431187).

61282221 is a wasteful number, since it uses less digits than its factorization.

61282221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20441.

The product of its digits is 768, while the sum is 24.

The square root of 61282221 is about 7828.2961747752. The cubic root of 61282221 is about 394.2558676248.

It can be divided in two parts, 61 and 282221, that added together give a palindrome (282282).

The spelling of 61282221 in words is "sixty-one million, two hundred eighty-two thousand, two hundred twenty-one".