61721222 has 8 divisors (see below), whose sum is σ = 95774400. Its totient is φ = 29796424.

The previous prime is 61721221. The next prime is 61721263. The reversal of 61721222 is 22212716.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61721221) 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, 532022 + ... + 532137.

It is an arithmetic number, because the mean of its divisors is an integer number (11971800).

Almost surely, 2^61721222 is an apocalyptic number.

61721222 is a deficient number, since it is larger than the sum of its proper divisors (34053178).

61721222 is a wasteful number, since it uses less digits than its factorization.

61721222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064190.

The product of its digits is 672, while the sum is 23.

The square root of 61721222 is about 7856.2855090685. The cubic root of 61721222 is about 395.1950582834.

Adding to 61721222 its reverse (22212716), we get a palindrome (83933938).

The spelling of 61721222 in words is "sixty-one million, seven hundred twenty-one thousand, two hundred twenty-two".