1021156055 has 8 divisors (see below), whose sum is σ = 1240151472. Its totient is φ = 807082048.

The previous prime is 1021156049. The next prime is 1021156057. The reversal of 1021156055 is 5506511201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021156055 - 2⁴ = 1021156039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021156057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1229894 + ... + 1230723.

It is an arithmetic number, because the mean of its divisors is an integer number (155018934).

Almost surely, 2^1021156055 is an apocalyptic number.

1021156055 is a deficient number, since it is larger than the sum of its proper divisors (218995417).

1021156055 is an equidigital number, since it uses as much as digits as its factorization.

1021156055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460705.

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

The square root of 1021156055 is about 31955.5324630963. The cubic root of 1021156055 is about 1007.0028637588.

Adding to 1021156055 its reverse (5506511201), we get a palindrome (6527667256).

It can be divided in two parts, 10211 and 56055, that added together give a palindrome (66266).

The spelling of 1021156055 in words is "one billion, twenty-one million, one hundred fifty-six thousand, fifty-five".