221262087 has 16 divisors (see below), whose sum is σ = 311077760. Its totient is φ = 139504032.

The previous prime is 221262071. The next prime is 221262091. The reversal of 221262087 is 780262122.

It is not a de Polignac number, because 221262087 - 2⁴ = 221262071 is a prime.

It is a super-2 number, since 2×221262087² = 97913822287191138, 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 (221262017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33633 + ... + 39669.

It is an arithmetic number, because the mean of its divisors is an integer number (19442360).

Almost surely, 2^221262087 is an apocalyptic number.

221262087 is a deficient number, since it is larger than the sum of its proper divisors (89815673).

221262087 is a wasteful number, since it uses less digits than its factorization.

221262087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6702.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 221262087 is about 14874.8810751549. The cubic root of 221262087 is about 604.8332641633.

The spelling of 221262087 in words is "two hundred twenty-one million, two hundred sixty-two thousand, eighty-seven".