2102155242 has 64 divisors (see below), whose sum is σ = 4800715776. Its totient is φ = 607439360.

The previous prime is 2102155189. The next prime is 2102155243. The reversal of 2102155242 is 2425512012.

It is a super-2 number, since 2×2102155242² = 8838113322936157128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2102155243) 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, 533893 + ... + 537815.

It is an arithmetic number, because the mean of its divisors is an integer number (75011184).

Almost surely, 2^2102155242 is an apocalyptic number.

2102155242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2102155242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2400357888).

2102155242 is an abundant number, since it is smaller than the sum of its proper divisors (2698560534).

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

2102155242 is a wasteful number, since it uses less digits than its factorization.

2102155242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4315.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 2102155242 is about 45849.2665372086. The cubic root of 2102155242 is about 1281.0171037735.

Adding to 2102155242 its reverse (2425512012), we get a palindrome (4527667254).

The spelling of 2102155242 in words is "two billion, one hundred two million, one hundred fifty-five thousand, two hundred forty-two".