61021217 has 8 divisors (see below), whose sum is σ = 64858560. Its totient is φ = 57246480.

The previous prime is 61021201. The next prime is 61021223. The reversal of 61021217 is 71212016.

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 61021217 - 2⁴ = 61021201 is a prime.

It is a super-2 number, since 2×61021217² = 7447177848322178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61021297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13634 + ... + 17547.

It is an arithmetic number, because the mean of its divisors is an integer number (8107320).

Almost surely, 2^61021217 is an apocalyptic number.

It is an amenable number.

61021217 is a deficient number, since it is larger than the sum of its proper divisors (3837343).

61021217 is a wasteful number, since it uses less digits than its factorization.

61021217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31303.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 61021217 is about 7811.6078370589. The cubic root of 61021217 is about 393.6953527251.

The spelling of 61021217 in words is "sixty-one million, twenty-one thousand, two hundred seventeen".