61263421 has 4 divisors (see below), whose sum is σ = 63927072. Its totient is φ = 58599772.

The previous prime is 61263373. The next prime is 61263431. The reversal of 61263421 is 12436216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61263421 - 2⁹ = 61262909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61263431) 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, 1331791 + ... + 1331836.

It is an arithmetic number, because the mean of its divisors is an integer number (15981768).

Almost surely, 2^61263421 is an apocalyptic number.

It is an amenable number.

61263421 is a deficient number, since it is larger than the sum of its proper divisors (2663651).

61263421 is a wasteful number, since it uses less digits than its factorization.

61263421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663650.

The product of its digits is 1728, while the sum is 25.

The square root of 61263421 is about 7827.0953105223. The cubic root of 61263421 is about 394.2155472389.

Adding to 61263421 its reverse (12436216), we get a palindrome (73699637).

The spelling of 61263421 in words is "sixty-one million, two hundred sixty-three thousand, four hundred twenty-one".