61324021 has 16 divisors (see below), whose sum is σ = 68584320. Its totient is φ = 54358720.

The previous prime is 61323991. The next prime is 61324027. The reversal of 61324021 is 12042316.

It is a cyclic number.

It is not a de Polignac number, because 61324021 - 2⁵ = 61323989 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 61324021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61324027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170640 + ... + 170998.

It is an arithmetic number, because the mean of its divisors is an integer number (4286520).

Almost surely, 2^61324021 is an apocalyptic number.

It is an amenable number.

61324021 is a deficient number, since it is larger than the sum of its proper divisors (7260299).

61324021 is a wasteful number, since it uses less digits than its factorization.

61324021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 61324021 is about 7830.9655215688. The cubic root of 61324021 is about 394.3454866012.

Adding to 61324021 its reverse (12042316), we get a palindrome (73366337).

It can be divided in two parts, 6132 and 4021, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 61324021 in words is "sixty-one million, three hundred twenty-four thousand, twenty-one".