61235021 has 2 divisors, whose sum is σ = 61235022. Its totient is φ = 61235020.

The previous prime is 61235011. The next prime is 61235023. The reversal of 61235021 is 12053216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59505796 + 1729225 = 7714^2 + 1315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61235021 is a prime.

Together with 61235023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61234984 and 61235002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61235023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30617510 + 30617511.

It is an arithmetic number, because the mean of its divisors is an integer number (30617511).

Almost surely, 2^61235021 is an apocalyptic number.

It is an amenable number.

61235021 is a deficient number, since it is larger than the sum of its proper divisors (1).

61235021 is an equidigital number, since it uses as much as digits as its factorization.

61235021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 61235021 is about 7825.2808895272. The cubic root of 61235021 is about 394.1546220745.

Adding to 61235021 its reverse (12053216), we get a palindrome (73288237).

The spelling of 61235021 in words is "sixty-one million, two hundred thirty-five thousand, twenty-one".