221012221122210 has 48 divisors (see below), whose sum is σ = 617030037749376. Its totient is φ = 50517079113312.

The previous prime is 221012221122193. The next prime is 221012221122223. The reversal of 221012221122210 is 12221122210122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75174223402 + ... + 75174226341.

It is an arithmetic number, because the mean of its divisors is an integer number (12854792453112).

Almost surely, 2^{221012221122210} is an apocalyptic number.

221012221122210 is an abundant number, since it is smaller than the sum of its proper divisors (396017816627166).

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

221012221122210 is a wasteful number, since it uses less digits than its factorization.

221012221122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150348449767 (or 150348449760 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221012221122210 its reverse (12221122210122), we get a palindrome (233233343332332).

The spelling of 221012221122210 in words is "two hundred twenty-one trillion, twelve billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred ten".