221545121531500 has 96 divisors (see below), whose sum is σ = 525943979136576. Its totient is φ = 81036777484800.

The previous prime is 221545121531483. The next prime is 221545121531537. The reversal of 221545121531500 is 5135121545122.

It is a self number, because there is not a number n which added to its sum of digits gives 221545121531500.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158574897 + ... + 159965896.

It is an arithmetic number, because the mean of its divisors is an integer number (5478583116006).

Almost surely, 2^{221545121531500} is an apocalyptic number.

221545121531500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221545121531500 is an abundant number, since it is smaller than the sum of its proper divisors (304398857605076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221545121531500 is a wasteful number, since it uses less digits than its factorization.

221545121531500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318540932 (or 318540920 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 37.

The spelling of 221545121531500 in words is "two hundred twenty-one trillion, five hundred forty-five billion, one hundred twenty-one million, five hundred thirty-one thousand, five hundred".