61207221 has 4 divisors (see below), whose sum is σ = 81609632. Its totient is φ = 40804812.

The previous prime is 61207199. The next prime is 61207229. The reversal of 61207221 is 12270216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61207221 - 2¹¹ = 61205173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61207229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10201201 + ... + 10201206.

It is an arithmetic number, because the mean of its divisors is an integer number (20402408).

Almost surely, 2^61207221 is an apocalyptic number.

It is an amenable number.

61207221 is a deficient number, since it is larger than the sum of its proper divisors (20402411).

61207221 is a wasteful number, since it uses less digits than its factorization.

61207221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20402410.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 61207221 is about 7823.5043938123. The cubic root of 61207221 is about 394.0949658139.

Adding to 61207221 its reverse (12270216), we get a palindrome (73477437).

The spelling of 61207221 in words is "sixty-one million, two hundred seven thousand, two hundred twenty-one".