1221002120484 has 72 divisors (see below), whose sum is σ = 3270724886520. Its totient is φ = 383381644800.

The previous prime is 1221002120449. The next prime is 1221002120539. The reversal of 1221002120484 is 4840212001221.

It can be written as a sum of positive squares in 4 ways, for example, as 3020601600 + 1217981518884 = 54960^2 + 1103622^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14219907 + ... + 14305514.

It is an arithmetic number, because the mean of its divisors is an integer number (45426734535).

Almost surely, 2^{1221002120484} is an apocalyptic number.

It is an amenable number.

1221002120484 is an abundant number, since it is smaller than the sum of its proper divisors (2049722766036).

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

1221002120484 is a wasteful number, since it uses less digits than its factorization.

1221002120484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28525501 (or 28525496 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The spelling of 1221002120484 in words is "one trillion, two hundred twenty-one billion, two million, one hundred twenty thousand, four hundred eighty-four".