61221830 has 16 divisors (see below), whose sum is σ = 110345760. Its totient is φ = 24456192.

The previous prime is 61221821. The next prime is 61221833. The reversal of 61221830 is 3812216.

It is a super-2 number, since 2×61221830² = 7496224937097800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61221796 and 61221805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61221833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4742 + ... + 12038.

It is an arithmetic number, because the mean of its divisors is an integer number (6896610).

Almost surely, 2^61221830 is an apocalyptic number.

61221830 is a deficient number, since it is larger than the sum of its proper divisors (49123930).

61221830 is a wasteful number, since it uses less digits than its factorization.

61221830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8143.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 61221830 is about 7824.4379989875. The cubic root of 61221830 is about 394.1263176450.

The spelling of 61221830 in words is "sixty-one million, two hundred twenty-one thousand, eight hundred thirty".