81950941421 has 8 divisors (see below), whose sum is σ = 88789529664. Its totient is φ = 75336569280.

The previous prime is 81950941351. The next prime is 81950941427. The reversal of 81950941421 is 12414905918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81950941421 - 2¹⁸ = 81950679277 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 (81950941427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56053265 + ... + 56054726.

It is an arithmetic number, because the mean of its divisors is an integer number (11098691208).

Almost surely, 2^81950941421 is an apocalyptic number.

It is an amenable number.

81950941421 is a deficient number, since it is larger than the sum of its proper divisors (6838588243).

81950941421 is a wasteful number, since it uses less digits than its factorization.

81950941421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112108051.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 81950941421 in words is "eighty-one billion, nine hundred fifty million, nine hundred forty-one thousand, four hundred twenty-one".