2157106224 has 120 divisors (see below), whose sum is σ = 6981063600. Its totient is φ = 568899072.

The previous prime is 2157106213. The next prime is 2157106241. The reversal of 2157106224 is 4226017512.

It is a junction number, because it is equal to n+sod(n) for n = 2157106191 and 2157106200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4699 + ... + 65850.

It is an arithmetic number, because the mean of its divisors is an integer number (58175530).

Almost surely, 2^2157106224 is an apocalyptic number.

2157106224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157106224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3490531800).

2157106224 is an abundant number, since it is smaller than the sum of its proper divisors (4823957376).

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

2157106224 is a wasteful number, since it uses less digits than its factorization.

2157106224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70587 (or 70574 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 2157106224 is about 46444.6576475702. The cubic root of 2157106224 is about 1292.0832920196.

The spelling of 2157106224 in words is "two billion, one hundred fifty-seven million, one hundred six thousand, two hundred twenty-four".