2121455626 has 8 divisors (see below), whose sum is σ = 3182483844. Its totient is φ = 1060627680.

The previous prime is 2121455599. The next prime is 2121455629. The reversal of 2121455626 is 6265541212.

It can be written as a sum of positive squares in 2 ways, for example, as 1975891401 + 145564225 = 44451^2 + 12065^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 2121455591 and 2121455600.

It is not an unprimeable number, because it can be changed into a prime (2121455629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19965 + ... + 68128.

Almost surely, 2^2121455626 is an apocalyptic number.

2121455626 is a deficient number, since it is larger than the sum of its proper divisors (1061028218).

2121455626 is a wasteful number, since it uses less digits than its factorization.

2121455626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100136.

The product of its digits is 28800, while the sum is 34.

The square root of 2121455626 is about 46059.2621087225. The cubic root of 2121455626 is about 1284.9256066790.

Adding to 2121455626 its reverse (6265541212), we get a palindrome (8386996838).

The spelling of 2121455626 in words is "two billion, one hundred twenty-one million, four hundred fifty-five thousand, six hundred twenty-six".