61721022 has 16 divisors (see below), whose sum is σ = 134664192. Its totient is φ = 18703320.

The previous prime is 61721017. The next prime is 61721027. The reversal of 61721022 is 22012716.

It is an interprime number because it is at equal distance from previous prime (61721017) and next prime (61721027).

It is a self number, because there is not a number n which added to its sum of digits gives 61721022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61721027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467518 + ... + 467649.

It is an arithmetic number, because the mean of its divisors is an integer number (8416512).

Almost surely, 2^61721022 is an apocalyptic number.

61721022 is an abundant number, since it is smaller than the sum of its proper divisors (72943170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61721022 is a wasteful number, since it uses less digits than its factorization.

61721022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935183.

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

The square root of 61721022 is about 7856.2727803966. The cubic root of 61721022 is about 395.1946314227.

Adding to 61721022 its reverse (22012716), we get a palindrome (83733738).

The spelling of 61721022 in words is "sixty-one million, seven hundred twenty-one thousand, twenty-two".