61827421 has 4 divisors (see below), whose sum is σ = 63265312. Its totient is φ = 60389532.

The previous prime is 61827413. The next prime is 61827433. The reversal of 61827421 is 12472816.

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 61827421 - 2³ = 61827413 is a prime.

It is a super-2 number, since 2×61827421² = 7645259975022482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61827461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718881 + ... + 718966.

It is an arithmetic number, because the mean of its divisors is an integer number (15816328).

Almost surely, 2^61827421 is an apocalyptic number.

It is an amenable number.

61827421 is a deficient number, since it is larger than the sum of its proper divisors (1437891).

61827421 is a wasteful number, since it uses less digits than its factorization.

61827421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437890.

The product of its digits is 5376, while the sum is 31.

The square root of 61827421 is about 7863.0414598932. The cubic root of 61827421 is about 395.4215890751.

The spelling of 61827421 in words is "sixty-one million, eight hundred twenty-seven thousand, four hundred twenty-one".