1321521144402 has 16 divisors (see below), whose sum is σ = 2798515364832. Its totient is φ = 414594868800.

The previous prime is 1321521144397. The next prime is 1321521144431. The reversal of 1321521144402 is 2044411251231.

It is a self number, because there is not a number n which added to its sum of digits gives 1321521144402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6478044724 + ... + 6478044927.

It is an arithmetic number, because the mean of its divisors is an integer number (174907210302).

Almost surely, 2^{1321521144402} is an apocalyptic number.

1321521144402 is an abundant number, since it is smaller than the sum of its proper divisors (1476994220430).

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

1321521144402 is a wasteful number, since it uses less digits than its factorization.

1321521144402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12956089673.

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 1321521144402 its reverse (2044411251231), we get a palindrome (3365932395633).

The spelling of 1321521144402 in words is "one trillion, three hundred twenty-one billion, five hundred twenty-one million, one hundred forty-four thousand, four hundred two".