1221420102240 has 384 divisors, whose sum is σ = 4320141557760. Its totient is φ = 287998599168.

The previous prime is 1221420102163. The next prime is 1221420102247. The reversal of 1221420102240 is 422010241221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221420102247) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22955347 + ... + 23008493.

It is an arithmetic number, because the mean of its divisors is an integer number (11250368640).

Almost surely, 2^{1221420102240} is an apocalyptic number.

1221420102240 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 1221420102240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2160070778880).

1221420102240 is an abundant number, since it is smaller than the sum of its proper divisors (3098721455520).

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

1221420102240 is a wasteful number, since it uses less digits than its factorization.

1221420102240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53334 (or 53326 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 1221420102240 its reverse (422010241221), we get a palindrome (1643430343461).

The spelling of 1221420102240 in words is "one trillion, two hundred twenty-one billion, four hundred twenty million, one hundred two thousand, two hundred forty".