221211201000 has 64 divisors (see below), whose sum is σ = 690178956480. Its totient is φ = 58989652800.

The previous prime is 221211200999. The next prime is 221211201059. The reversal of 221211201000 is 102112122.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 36865534 + ... + 36871533.

It is an arithmetic number, because the mean of its divisors is an integer number (10784046195).

Almost surely, 2^221211201000 is an apocalyptic number.

221211201000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211201000 is an abundant number, since it is smaller than the sum of its proper divisors (468967755480).

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

221211201000 is a wasteful number, since it uses less digits than its factorization.

221211201000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73737091 (or 73737077 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221211201000 its reverse (102112122), we get a palindrome (221313313122).

The spelling of 221211201000 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred one thousand".