61243021 has 8 divisors (see below), whose sum is σ = 71481600. Its totient is φ = 51376848.

The previous prime is 61242977. The next prime is 61243057. The reversal of 61243021 is 12034216.

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 61243021 - 2²³ = 52854413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61243021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61243081) 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, 92746 + ... + 93403.

It is an arithmetic number, because the mean of its divisors is an integer number (8935200).

Almost surely, 2^61243021 is an apocalyptic number.

It is an amenable number.

61243021 is a deficient number, since it is larger than the sum of its proper divisors (10238579).

61243021 is a wasteful number, since it uses less digits than its factorization.

61243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186203.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 61243021 is about 7825.7920365928. The cubic root of 61243021 is about 394.1717859981.

Adding to 61243021 its reverse (12034216), we get a palindrome (73277237).

The spelling of 61243021 in words is "sixty-one million, two hundred forty-three thousand, twenty-one".