2161450100056 has 32 divisors (see below), whose sum is σ = 4505255798400. Its totient is φ = 965411953920.

The previous prime is 2161450100053. The next prime is 2161450100057. The reversal of 2161450100056 is 6500010541612.

It is a super-2 number, since 2×2161450100056² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161450100053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335209261 + ... + 335215708.

It is an arithmetic number, because the mean of its divisors is an integer number (140789243700).

Almost surely, 2^{2161450100056} is an apocalyptic number.

2161450100056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2161450100056 is an abundant number, since it is smaller than the sum of its proper divisors (2343805698344).

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

2161450100056 is a wasteful number, since it uses less digits than its factorization.

2161450100056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670425019 (or 670425015 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 2161450100056 its reverse (6500010541612), we get a palindrome (8661460641668).

The spelling of 2161450100056 in words is "two trillion, one hundred sixty-one billion, four hundred fifty million, one hundred thousand, fifty-six".