121531201220000 has 1920 divisors, whose sum is σ = 371400946253568. Its totient is φ = 38541312000000.

The previous prime is 121531201219949. The next prime is 121531201220059. The reversal of 121531201220000 is 22102135121.

It is a super-2 number, since 2×121531201220000² (a number of 29 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 887089059932 + ... + 887089060068.

Almost surely, 2^{121531201220000} is an apocalyptic number.

121531201220000 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 121531201220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185700473126784).

121531201220000 is an abundant number, since it is smaller than the sum of its proper divisors (249869745033568).

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

121531201220000 is a wasteful number, since it uses less digits than its factorization.

121531201220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 121531201220000 its reverse (22102135121), we get a palindrome (121553303355121).

The spelling of 121531201220000 in words is "one hundred twenty-one trillion, five hundred thirty-one billion, two hundred one million, two hundred twenty thousand".