10021155 has 16 divisors (see below), whose sum is σ = 16074240. Its totient is φ = 5331168.

The previous prime is 10021147. The next prime is 10021157. The reversal of 10021155 is 55112001.

10021155 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 10021155 - 2³ = 10021147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (10021157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9126 + ... + 10164.

It is an arithmetic number, because the mean of its divisors is an integer number (1004640).

Almost surely, 2^10021155 is an apocalyptic number.

10021155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

10021155 is a deficient number, since it is larger than the sum of its proper divisors (6053085).

10021155 is a wasteful number, since it uses less digits than its factorization.

10021155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 10021155 is about 3165.6207921986. The cubic root of 10021155 is about 215.5952855504.

Adding to 10021155 its reverse (55112001), we get a palindrome (65133156).

The spelling of 10021155 in words is "ten million, twenty-one thousand, one hundred fifty-five".