197421354108 has 144 divisors (see below), whose sum is σ = 567249621120. Its totient is φ = 59540443200.

The previous prime is 197421354079. The next prime is 197421354199. The reversal of 197421354108 is 801453124791.

197421354108 is a `hidden beast` number, since 1 + 97 + 4 + 2 + 13 + 541 + 0 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2212258 + ... + 2299766.

It is an arithmetic number, because the mean of its divisors is an integer number (3939233480).

Almost surely, 2^197421354108 is an apocalyptic number.

197421354108 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197421354108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283624810560).

197421354108 is an abundant number, since it is smaller than the sum of its proper divisors (369828267012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

197421354108 is a wasteful number, since it uses less digits than its factorization.

197421354108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87750 (or 87736 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

Adding to 197421354108 its reverse (801453124791), we get a palindrome (998874478899).

The spelling of 197421354108 in words is "one hundred ninety-seven billion, four hundred twenty-one million, three hundred fifty-four thousand, one hundred eight".