1213521402402 has 192 divisors, whose sum is σ = 2958134100480. Its totient is φ = 367351096320.

The previous prime is 1213521402383. The next prime is 1213521402427. The reversal of 1213521402402 is 2042041253121.

1213521402402 is a `hidden beast` number, since 1 + 213 + 5 + 2 + 1 + 40 + 2 + 402 = 666.

It is a super-3 number, since 3×1213521402402³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 181038183 + ... + 181044885.

It is an arithmetic number, because the mean of its divisors is an integer number (15406948440).

Almost surely, 2^{1213521402402} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213521402402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1479067050240).

1213521402402 is an abundant number, since it is smaller than the sum of its proper divisors (1744612698078).

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

1213521402402 is a wasteful number, since it uses less digits than its factorization.

1213521402402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6906 (or 6839 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 1213521402402 its reverse (2042041253121), we get a palindrome (3255562655523).

The spelling of 1213521402402 in words is "one trillion, two hundred thirteen billion, five hundred twenty-one million, four hundred two thousand, four hundred two".