1321521102 has 96 divisors (see below), whose sum is σ = 3307358880. Its totient is φ = 390614400.

The previous prime is 1321521073. The next prime is 1321521139. The reversal of 1321521102 is 2011251231.

1321521102 is a `hidden beast` number, since 132 + 1 + 521 + 10 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 265428 + ... + 270360.

It is an arithmetic number, because the mean of its divisors is an integer number (34451655).

Almost surely, 2^1321521102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321521102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1653679440).

1321521102 is an abundant number, since it is smaller than the sum of its proper divisors (1985837778).

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

1321521102 is a wasteful number, since it uses less digits than its factorization.

1321521102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5007 (or 4990 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1321521102 is about 36352.7316992822. The cubic root of 1321521102 is about 1097.3825098603.

Adding to 1321521102 its reverse (2011251231), we get a palindrome (3332772333).

The spelling of 1321521102 in words is "one billion, three hundred twenty-one million, five hundred twenty-one thousand, one hundred two".