61221344 has 24 divisors (see below), whose sum is σ = 126874440. Its totient is φ = 28999296.

The previous prime is 61221343. The next prime is 61221353. The reversal of 61221344 is 44312216.

It is a super-2 number, since 2×61221344² = 7496105922332672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61221341) 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, 49739 + ... + 50954.

It is an arithmetic number, because the mean of its divisors is an integer number (5286435).

Almost surely, 2^61221344 is an apocalyptic number.

It is an amenable number.

61221344 is an abundant number, since it is smaller than the sum of its proper divisors (65653096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61221344 is a wasteful number, since it uses less digits than its factorization.

61221344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100722 (or 100714 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 61221344 is about 7824.4069423823. The cubic root of 61221344 is about 394.1252747387.

The spelling of 61221344 in words is "sixty-one million, two hundred twenty-one thousand, three hundred forty-four".