2121170427 has 24 divisors (see below), whose sum is σ = 3246815520. Its totient is φ = 1329834240.

The previous prime is 2121170371. The next prime is 2121170449. The reversal of 2121170427 is 7240711212.

It is a happy number.

2121170427 is a `hidden beast` number, since 21 + 211 + 7 + 0 + 427 = 666.

It is not a de Polignac number, because 2121170427 - 2¹⁴ = 2121154043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121170427.

It is not an unprimeable number, because it can be changed into a prime (2121170027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206274 + ... + 216312.

It is an arithmetic number, because the mean of its divisors is an integer number (135283980).

Almost surely, 2^2121170427 is an apocalyptic number.

2121170427 is a deficient number, since it is larger than the sum of its proper divisors (1125645093).

2121170427 is a wasteful number, since it uses less digits than its factorization.

2121170427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11443 (or 11440 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 2121170427 is about 46056.1660041302. The cubic root of 2121170427 is about 1284.8680242158.

Adding to 2121170427 its reverse (7240711212), we get a palindrome (9361881639).

The spelling of 2121170427 in words is "two billion, one hundred twenty-one million, one hundred seventy thousand, four hundred twenty-seven".