61331100180421 has 4 divisors (see below), whose sum is σ = 61575447193344. Its totient is φ = 61086753167500.

The previous prime is 61331100180419. The next prime is 61331100180431. The reversal of 61331100180421 is 12408100113316.

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 61331100180421 - 2¹ = 61331100180419 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 (61331100180431) 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, 122173506085 + ... + 122173506586.

It is an arithmetic number, because the mean of its divisors is an integer number (15393861798336).

Almost surely, 2^{61331100180421} is an apocalyptic number.

It is an amenable number.

61331100180421 is a deficient number, since it is larger than the sum of its proper divisors (244347012923).

61331100180421 is a wasteful number, since it uses less digits than its factorization.

61331100180421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244347012922.

The product of its (nonzero) digits is 3456, while the sum is 31.

Adding to 61331100180421 its reverse (12408100113316), we get a palindrome (73739200293737).

The spelling of 61331100180421 in words is "sixty-one trillion, three hundred thirty-one billion, one hundred million, one hundred eighty thousand, four hundred twenty-one".