2101223457 has 16 divisors (see below), whose sum is σ = 3126646080. Its totient is φ = 1394640576.

The previous prime is 2101223441. The next prime is 2101223461. The reversal of 2101223457 is 7543221012.

It is not a de Polignac number, because 2101223457 - 2⁴ = 2101223441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 2101223457.

It is not an unprimeable number, because it can be changed into a prime (2101223557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165288 + ... + 177545.

It is an arithmetic number, because the mean of its divisors is an integer number (195415380).

Almost surely, 2^2101223457 is an apocalyptic number.

2101223457 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2101223457 is a deficient number, since it is larger than the sum of its proper divisors (1025422623).

2101223457 is a wasteful number, since it uses less digits than its factorization.

2101223457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343069 (or 343063 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 2101223457 is about 45839.1040161127. The cubic root of 2101223457 is about 1280.8278045721.

Adding to 2101223457 its reverse (7543221012), we get a palindrome (9644444469).

The spelling of 2101223457 in words is "two billion, one hundred one million, two hundred twenty-three thousand, four hundred fifty-seven".