2221881525 has 72 divisors (see below), whose sum is σ = 4092416640. Its totient is φ = 1151781120.

The previous prime is 2221881517. The next prime is 2221881533. The reversal of 2221881525 is 5251881222.

2221881525 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2221881517) and next prime (2221881533).

It is not a de Polignac number, because 2221881525 - 2³ = 2221881517 is a prime.

It is a super-2 number, since 2×2221881525² = 9873515022272651250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2221881525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1723081 + ... + 1724369.

It is an arithmetic number, because the mean of its divisors is an integer number (56839120).

Almost surely, 2^2221881525 is an apocalyptic number.

2221881525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2221881525 is a deficient number, since it is larger than the sum of its proper divisors (1870535115).

2221881525 is a wasteful number, since it uses less digits than its factorization.

2221881525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515 (or 1507 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 2221881525 is about 47136.8383008449. The cubic root of 2221881525 is about 1304.8891877547.

The spelling of 2221881525 in words is "two billion, two hundred twenty-one million, eight hundred eighty-one thousand, five hundred twenty-five".