221210210990 has 64 divisors (see below), whose sum is σ = 419123678400. Its totient is φ = 83938089984.

The previous prime is 221210210989. The next prime is 221210211007. The reversal of 221210210990 is 99012012122.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is a congruent number.

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, 57710114 + ... + 57713946.

It is an arithmetic number, because the mean of its divisors is an integer number (6548807475).

Almost surely, 2^221210210990 is an apocalyptic number.

221210210990 is a deficient number, since it is larger than the sum of its proper divisors (197913467410).

221210210990 is a wasteful number, since it uses less digits than its factorization.

221210210990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7301.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 221210210990 in words is "two hundred twenty-one billion, two hundred ten million, two hundred ten thousand, nine hundred ninety".