2215426021 has 4 divisors (see below), whose sum is σ = 2269460844. Its totient is φ = 2161391200.

The previous prime is 2215426013. The next prime is 2215426027. The reversal of 2215426021 is 1206245122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 787644225 + 1427781796 = 28065^2 + 37786^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215426021 - 2³ = 2215426013 is a prime.

It is a super-2 number, since 2×2215426021² = 9816224909047784882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215426027) 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, 27017350 + ... + 27017431.

It is an arithmetic number, because the mean of its divisors is an integer number (567365211).

Almost surely, 2^2215426021 is an apocalyptic number.

It is an amenable number.

2215426021 is a deficient number, since it is larger than the sum of its proper divisors (54034823).

2215426021 is an equidigital number, since it uses as much as digits as its factorization.

2215426021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54034822.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2215426021 is about 47068.3122811940. The cubic root of 2215426021 is about 1303.6242105087.

The spelling of 2215426021 in words is "two billion, two hundred fifteen million, four hundred twenty-six thousand, twenty-one".