1021552215552 has 240 divisors, whose sum is σ = 3269029317840. Its totient is φ = 304485580800.

The previous prime is 1021552215547. The next prime is 1021552215631. The reversal of 1021552215552 is 2555122551201.

1021552215552 is a `hidden beast` number, since 1 + 0 + 2 + 1 + 552 + 2 + 1 + 55 + 52 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2926774 + ... + 3257162.

It is an arithmetic number, because the mean of its divisors is an integer number (13620955491).

Almost surely, 2^{1021552215552} is an apocalyptic number.

1021552215552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021552215552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1634514658920).

1021552215552 is an abundant number, since it is smaller than the sum of its proper divisors (2247477102288).

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

1021552215552 is a wasteful number, since it uses less digits than its factorization.

1021552215552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330485 (or 330466 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 36.

Adding to 1021552215552 its reverse (2555122551201), we get a palindrome (3576674766753).

The spelling of 1021552215552 in words is "one trillion, twenty-one billion, five hundred fifty-two million, two hundred fifteen thousand, five hundred fifty-two".