1021056155 has 16 divisors (see below), whose sum is σ = 1401726144. Its totient is φ = 699442560.

The previous prime is 1021056151. The next prime is 1021056163. The reversal of 1021056155 is 5516501201.

It is not a de Polignac number, because 1021056155 - 2² = 1021056151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021056151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21449 + ... + 50021.

It is an arithmetic number, because the mean of its divisors is an integer number (87607884).

Almost surely, 2^1021056155 is an apocalyptic number.

1021056155 is a deficient number, since it is larger than the sum of its proper divisors (380669989).

1021056155 is a wasteful number, since it uses less digits than its factorization.

1021056155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29606.

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 1021056155 is about 31953.9693152510. The cubic root of 1021056155 is about 1006.9700242248.

Adding to 1021056155 its reverse (5516501201), we get a palindrome (6537557356).

The spelling of 1021056155 in words is "one billion, twenty-one million, fifty-six thousand, one hundred fifty-five".