121311222140 has 24 divisors (see below), whose sum is σ = 255254086080. Its totient is φ = 48429151808.

The previous prime is 121311222121. The next prime is 121311222143. The reversal of 121311222140 is 41222113121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121311222143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5948132 + ... + 5968491.

It is an arithmetic number, because the mean of its divisors is an integer number (10635586920).

Almost surely, 2^121311222140 is an apocalyptic number.

121311222140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121311222140 is an abundant number, since it is smaller than the sum of its proper divisors (133942863940).

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

121311222140 is a wasteful number, since it uses less digits than its factorization.

121311222140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11917141 (or 11917139 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 121311222140 its reverse (41222113121), we get a palindrome (162533335261).

The spelling of 121311222140 in words is "one hundred twenty-one billion, three hundred eleven million, two hundred twenty-two thousand, one hundred forty".