1231941220020 has 864 divisors, whose sum is σ = 4756610476800. Its totient is φ = 252069801984.

The previous prime is 1231941219973. The next prime is 1231941220049. The reversal of 1231941220020 is 200221491321.

1231941220020 is a `hidden beast` number, since 1 + 23 + 1 + 9 + 412 + 200 + 20 = 666.

It is a super-3 number, since 3×1231941220020³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 1127118594 + ... + 1127119686.

It is an arithmetic number, because the mean of its divisors is an integer number (5505336200).

Almost surely, 2^{1231941220020} is an apocalyptic number.

1231941220020 is a gapful number since it is divisible by the number (10) 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 1231941220020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2378305238400).

1231941220020 is an abundant number, since it is smaller than the sum of its proper divisors (3524669256780).

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

1231941220020 is a wasteful number, since it uses less digits than its factorization.

1231941220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1269 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 1231941220020 in words is "one trillion, two hundred thirty-one billion, nine hundred forty-one million, two hundred twenty thousand, twenty".