1221010422240 has 96 divisors (see below), whose sum is σ = 4395637532160. Its totient is φ = 279088095744.

The previous prime is 1221010422131. The next prime is 1221010422263. The reversal of 1221010422240 is 422240101221.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181694620 + ... + 181701339.

It is an arithmetic number, because the mean of its divisors is an integer number (45787890960).

Almost surely, 2^{1221010422240} is an apocalyptic number.

1221010422240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221010422240 is an abundant number, since it is smaller than the sum of its proper divisors (3174627109920).

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

1221010422240 is a wasteful number, since it uses less digits than its factorization.

1221010422240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363395984 (or 363395976 counting only the distinct ones).

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

Adding to 1221010422240 its reverse (422240101221), we get a palindrome (1643250523461).

The spelling of 1221010422240 in words is "one trillion, two hundred twenty-one billion, ten million, four hundred twenty-two thousand, two hundred forty".