61223421 has 16 divisors (see below), whose sum is σ = 94573184. Its totient is φ = 34504704.

The previous prime is 61223417. The next prime is 61223423. The reversal of 61223421 is 12432216.

It is not a de Polignac number, because 61223421 - 2² = 61223417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61223423) 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, 18436 + ... + 21501.

It is an arithmetic number, because the mean of its divisors is an integer number (5910824).

Almost surely, 2^61223421 is an apocalyptic number.

It is an amenable number.

61223421 is a deficient number, since it is larger than the sum of its proper divisors (33349763).

61223421 is a wasteful number, since it uses less digits than its factorization.

61223421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40020.

The product of its digits is 576, while the sum is 21.

The square root of 61223421 is about 7824.5396669708. The cubic root of 61223421 is about 394.1297317297.

Adding to 61223421 its reverse (12432216), we get a palindrome (73655637).

The spelling of 61223421 in words is "sixty-one million, two hundred twenty-three thousand, four hundred twenty-one".