221528836892 has 48 divisors (see below), whose sum is σ = 445969238400. Its totient is φ = 95225549760.

The previous prime is 221528836889. The next prime is 221528836913. The reversal of 221528836892 is 298638825122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235334 + ... + 706002.

It is an arithmetic number, because the mean of its divisors is an integer number (9291025800).

Almost surely, 2^221528836892 is an apocalyptic number.

221528836892 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a pronic number, being equal to 470668×470669.

It is an amenable number.

221528836892 is an abundant number, since it is smaller than the sum of its proper divisors (224440401508).

221528836892 is a wasteful number, since it uses less digits than its factorization.

221528836892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471266 (or 471264 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 56.

The spelling of 221528836892 in words is "two hundred twenty-one billion, five hundred twenty-eight million, eight hundred thirty-six thousand, eight hundred ninety-two".