61231547421 has 24 divisors (see below), whose sum is σ = 97648570656. Its totient is φ = 36662915040.

The previous prime is 61231547381. The next prime is 61231547497. The reversal of 61231547421 is 12474513216.

61231547421 is a `hidden beast` number, since 61 + 2 + 31 + 547 + 4 + 21 = 666.

It is not a de Polignac number, because 61231547421 - 2²⁹ = 60694676509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61231547021) 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 23 ways as a sum of consecutive naturals, for example, 3717690 + ... + 3734123.

It is an arithmetic number, because the mean of its divisors is an integer number (4068690444).

Almost surely, 2^61231547421 is an apocalyptic number.

It is an amenable number.

61231547421 is a deficient number, since it is larger than the sum of its proper divisors (36417023235).

61231547421 is a wasteful number, since it uses less digits than its factorization.

61231547421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7451913 (or 7451910 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The spelling of 61231547421 in words is "sixty-one billion, two hundred thirty-one million, five hundred forty-seven thousand, four hundred twenty-one".