198132971421 has 40 divisors (see below), whose sum is σ = 336205777824. Its totient is φ = 102926177760.

The previous prime is 198132971357. The next prime is 198132971431. The reversal of 198132971421 is 124179231891.

It is not a de Polignac number, because 198132971421 - 2⁶ = 198132971357 is a prime.

It is a super-3 number, since 3×198132971421³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198132971431) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1171086 + ... + 1329551.

Almost surely, 2^198132971421 is an apocalyptic number.

198132971421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

198132971421 is a deficient number, since it is larger than the sum of its proper divisors (138072806403).

198132971421 is an equidigital number, since it uses as much as digits as its factorization.

198132971421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500679 (or 2500658 counting only the distinct ones).

The product of its digits is 217728, while the sum is 48.

The spelling of 198132971421 in words is "one hundred ninety-eight billion, one hundred thirty-two million, nine hundred seventy-one thousand, four hundred twenty-one".