2121015225 has 36 divisors (see below), whose sum is σ = 4079282064. Its totient is φ = 969605280.

The previous prime is 2121015223. The next prime is 2121015229. The reversal of 2121015225 is 5225101212.

It is not a de Polignac number, because 2121015225 - 2¹ = 2121015223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2121015223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 284899 + ... + 292248.

Almost surely, 2^2121015225 is an apocalyptic number.

2121015225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121015225 is a deficient number, since it is larger than the sum of its proper divisors (1958266839).

2121015225 is a wasteful number, since it uses less digits than its factorization.

2121015225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577174 (or 577162 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 2121015225 is about 46054.4810523363. The cubic root of 2121015225 is about 1284.8366863362.

Adding to 2121015225 its reverse (5225101212), we get a palindrome (7346116437).

The spelling of 2121015225 in words is "two billion, one hundred twenty-one million, fifteen thousand, two hundred twenty-five".