421201193556 has 192 divisors, whose sum is σ = 1243691237376. Its totient is φ = 109060300800.

The previous prime is 421201193551. The next prime is 421201193557. The reversal of 421201193556 is 655391102124.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421201193551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1051380 + ... + 1395636.

It is an arithmetic number, because the mean of its divisors is an integer number (6477558528).

Almost surely, 2^421201193556 is an apocalyptic number.

421201193556 is a gapful number since it is divisible by the number (46) 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 421201193556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (621845618688).

421201193556 is an abundant number, since it is smaller than the sum of its proper divisors (822490043820).

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

421201193556 is a wasteful number, since it uses less digits than its factorization.

421201193556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344342 (or 344340 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 421201193556 in words is "four hundred twenty-one billion, two hundred one million, one hundred ninety-three thousand, five hundred fifty-six".