1021151256156 has 72 divisors (see below), whose sum is σ = 2626331919120. Its totient is φ = 334472696064.

The previous prime is 1021151256127. The next prime is 1021151256239. The reversal of 1021151256156 is 6516521511201.

1021151256156 is a `hidden beast` number, since 1 + 0 + 2 + 1 + 15 + 1 + 25 + 615 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1021151256156.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15310 + ... + 1429173.

It is an arithmetic number, because the mean of its divisors is an integer number (36476832210).

Almost surely, 2^{1021151256156} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021151256156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1313165959560).

1021151256156 is an abundant number, since it is smaller than the sum of its proper divisors (1605180662964).

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

1021151256156 is a wasteful number, since it uses less digits than its factorization.

1021151256156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444835 (or 1444830 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 36.

Adding to 1021151256156 its reverse (6516521511201), we get a palindrome (7537672767357).

The spelling of 1021151256156 in words is "one trillion, twenty-one billion, one hundred fifty-one million, two hundred fifty-six thousand, one hundred fifty-six".