81922221403 has 36 divisors (see below), whose sum is σ = 92184732504. Its totient is φ = 72196416000.

The previous prime is 81922221373. The next prime is 81922221413. The reversal of 81922221403 is 30412222918.

It is a happy number.

It is not a de Polignac number, because 81922221403 - 2⁵ = 81922221371 is a prime.

It is a super-2 number, since 2×81922221403² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81922221413) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 597972351 + ... + 597972487.

It is an arithmetic number, because the mean of its divisors is an integer number (2560687014).

Almost surely, 2^81922221403 is an apocalyptic number.

81922221403 is a deficient number, since it is larger than the sum of its proper divisors (10262511101).

81922221403 is a wasteful number, since it uses less digits than its factorization.

81922221403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

It can be divided in two parts, 819 and 22221403, that added together give a palindrome (22222222).

The spelling of 81922221403 in words is "eighty-one billion, nine hundred twenty-two million, two hundred twenty-one thousand, four hundred three".