1621864431132 has 192 divisors, whose sum is σ = 4292775567360. Its totient is φ = 472293619200.

The previous prime is 1621864431119. The next prime is 1621864431191. The reversal of 1621864431132 is 2311344681261.

It is a super-3 number, since 3×1621864431132³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 189399483 + ... + 189408045.

It is an arithmetic number, because the mean of its divisors is an integer number (22358206080).

Almost surely, 2^{1621864431132} is an apocalyptic number.

1621864431132 is a gapful number since it is divisible by the number (12) 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 1621864431132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2146387783680).

1621864431132 is an abundant number, since it is smaller than the sum of its proper divisors (2670911136228).

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

1621864431132 is a wasteful number, since it uses less digits than its factorization.

1621864431132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9144 (or 9142 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The spelling of 1621864431132 in words is "one trillion, six hundred twenty-one billion, eight hundred sixty-four million, four hundred thirty-one thousand, one hundred thirty-two".