2021023155 has 32 divisors (see below), whose sum is σ = 3428780544. Its totient is φ = 1013014016.

The previous prime is 2021023153. The next prime is 2021023157. The reversal of 2021023155 is 5513201202.

It is an interprime number because it is at equal distance from previous prime (2021023153) and next prime (2021023157).

It is a cyclic number.

It is not a de Polignac number, because 2021023155 - 2¹ = 2021023153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021023153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184132 + ... + 194798.

It is an arithmetic number, because the mean of its divisors is an integer number (107149392).

Almost surely, 2^2021023155 is an apocalyptic number.

2021023155 is a deficient number, since it is larger than the sum of its proper divisors (1407757389).

2021023155 is a wasteful number, since it uses less digits than its factorization.

2021023155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11435.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 2021023155 is about 44955.7911174968. The cubic root of 2021023155 is about 1264.3202574293.

Adding to 2021023155 its reverse (5513201202), we get a palindrome (7534224357).

It can be divided in two parts, 20210 and 23155, that added together give a triangular number (43365 = T₂₉₄).

The spelling of 2021023155 in words is "two billion, twenty-one million, twenty-three thousand, one hundred fifty-five".