61221371 has 2 divisors, whose sum is σ = 61221372. Its totient is φ = 61221370.

The previous prime is 61221361. The next prime is 61221389. The reversal of 61221371 is 17312216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61221371 - 2²² = 57027067 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61221341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30610685 + 30610686.

It is an arithmetic number, because the mean of its divisors is an integer number (30610686).

Almost surely, 2^61221371 is an apocalyptic number.

61221371 is a deficient number, since it is larger than the sum of its proper divisors (1).

61221371 is an equidigital number, since it uses as much as digits as its factorization.

61221371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 23.

The square root of 61221371 is about 7824.4086677525. The cubic root of 61221371 is about 394.1253326781.

Adding to 61221371 its reverse (17312216), we get a palindrome (78533587).

The spelling of 61221371 in words is "sixty-one million, two hundred twenty-one thousand, three hundred seventy-one".