61402221 has 12 divisors (see below), whose sum is σ = 89063260. Its totient is φ = 40763520.

The previous prime is 61402219. The next prime is 61402267. The reversal of 61402221 is 12220416.

It can be written as a sum of positive squares in 2 ways, for example, as 36542025 + 24860196 = 6045^2 + 4986^2 .

It is not a de Polignac number, because 61402221 - 2¹ = 61402219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61402194 and 61402203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61402021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11986 + ... + 16323.

Almost surely, 2^61402221 is an apocalyptic number.

It is an amenable number.

61402221 is a deficient number, since it is larger than the sum of its proper divisors (27661039).

61402221 is a wasteful number, since it uses less digits than its factorization.

61402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28556 (or 28553 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 61402221 is about 7835.9569294375. The cubic root of 61402221 is about 394.5130376835.

Adding to 61402221 its reverse (12220416), we get a palindrome (73622637).

The spelling of 61402221 in words is "sixty-one million, four hundred two thousand, two hundred twenty-one".