1231111021420 has 48 divisors (see below), whose sum is σ = 2995141359168. Its totient is φ = 416313077760.

The previous prime is 1231111021331. The next prime is 1231111021451. The reversal of 1231111021420 is 241201111321.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60220261 + ... + 60240700.

It is an arithmetic number, because the mean of its divisors is an integer number (62398778316).

Almost surely, 2^{1231111021420} is an apocalyptic number.

1231111021420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231111021420 is an abundant number, since it is smaller than the sum of its proper divisors (1764030337748).

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

1231111021420 is a wasteful number, since it uses less digits than its factorization.

1231111021420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120461050 (or 120461048 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1231111021420 its reverse (241201111321), we get a palindrome (1472312132741).

The spelling of 1231111021420 in words is "one trillion, two hundred thirty-one billion, one hundred eleven million, twenty-one thousand, four hundred twenty".