2161421276 has 48 divisors (see below), whose sum is σ = 4581432576. Its totient is φ = 871014144.

The previous prime is 2161421257. The next prime is 2161421279. The reversal of 2161421276 is 6721241612.

2161421276 = T₃₄₉ + T₃₅₀ + ... + T₂₃₅₁.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161421279) 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, 952295 + ... + 954561.

It is an arithmetic number, because the mean of its divisors is an integer number (95446512).

Almost surely, 2^2161421276 is an apocalyptic number.

It is an amenable number.

2161421276 is an abundant number, since it is smaller than the sum of its proper divisors (2420011300).

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

2161421276 is a wasteful number, since it uses less digits than its factorization.

2161421276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4298 (or 4296 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 2161421276 is about 46491.0881352545. The cubic root of 2161421276 is about 1292.9442746633.

Adding to 2161421276 its reverse (6721241612), we get a palindrome (8882662888).

The spelling of 2161421276 in words is "two billion, one hundred sixty-one million, four hundred twenty-one thousand, two hundred seventy-six".