61036021 has 4 divisors (see below), whose sum is σ = 61088044. Its totient is φ = 60984000.

The previous prime is 61036013. The next prime is 61036067. The reversal of 61036021 is 12063016.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27973521 + 33062500 = 5289^2 + 5750^2 .

It is a cyclic number.

It is not a de Polignac number, because 61036021 - 2³ = 61036013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61036021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61036081) 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, 24210 + ... + 26611.

It is an arithmetic number, because the mean of its divisors is an integer number (15272011).

Almost surely, 2^61036021 is an apocalyptic number.

It is an amenable number.

61036021 is a deficient number, since it is larger than the sum of its proper divisors (52023).

61036021 is a wasteful number, since it uses less digits than its factorization.

61036021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52022.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 61036021 is about 7812.5553438040. Note that the first 3 decimals coincide. The cubic root of 61036021 is about 393.7271875252.

Adding to 61036021 its reverse (12063016), we get a palindrome (73099037).

It can be divided in two parts, 6 and 1036021, that multiplied together give a palindrome (6216126).

The spelling of 61036021 in words is "sixty-one million, thirty-six thousand, twenty-one".