61830021 has 8 divisors (see below), whose sum is σ = 89934624. Its totient is φ = 37472720.

The previous prime is 61830019. The next prime is 61830029. The reversal of 61830021 is 12003816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61830021 - 2¹ = 61830019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61830021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61830029) 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, 936786 + ... + 936851.

It is an arithmetic number, because the mean of its divisors is an integer number (11241828).

Almost surely, 2^61830021 is an apocalyptic number.

It is an amenable number.

61830021 is a deficient number, since it is larger than the sum of its proper divisors (28104603).

61830021 is a wasteful number, since it uses less digits than its factorization.

61830021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873651.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 61830021 is about 7863.2067885819. The cubic root of 61830021 is about 395.4271318246.

Adding to 61830021 its reverse (12003816), we get a palindrome (73833837).

The spelling of 61830021 in words is "sixty-one million, eight hundred thirty thousand, twenty-one".