121221101040 has 160 divisors (see below), whose sum is σ = 406929746496. Its totient is φ = 29674045440.

The previous prime is 121221101011. The next prime is 121221101041. The reversal of 121221101040 is 40101122121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221101041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 457392 + ... + 672048.

Almost surely, 2^121221101040 is an apocalyptic number.

121221101040 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 121221101040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203464873248).

121221101040 is an abundant number, since it is smaller than the sum of its proper divisors (285708645456).

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

121221101040 is a wasteful number, since it uses less digits than its factorization.

121221101040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214867 (or 214861 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121221101040 its reverse (40101122121), we get a palindrome (161322223161).

The spelling of 121221101040 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, forty".