61442821 has 12 divisors (see below), whose sum is σ = 70076160. Its totient is φ = 53423480.

The previous prime is 61442809. The next prime is 61442831. The reversal of 61442821 is 12824416.

It is not a de Polignac number, because 61442821 - 2¹⁵ = 61410053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61442821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61442831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 540 + ... + 11098.

It is an arithmetic number, because the mean of its divisors is an integer number (5839680).

Almost surely, 2^61442821 is an apocalyptic number.

It is an amenable number.

61442821 is a deficient number, since it is larger than the sum of its proper divisors (8633339).

61442821 is a wasteful number, since it uses less digits than its factorization.

61442821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10616 (or 10593 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 61442821 is about 7838.5471230324. The cubic root of 61442821 is about 394.5999710229.

The spelling of 61442821 in words is "sixty-one million, four hundred forty-two thousand, eight hundred twenty-one".