221000012100 has 216 divisors, whose sum is σ = 813068529728. Its totient is φ = 49148985600.

The previous prime is 221000012069. The next prime is 221000012131. The reversal of 221000012100 is 1210000122.

It is an interprime number because it is at equal distance from previous prime (221000012069) and next prime (221000012131).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 240946 + ... + 707145.

Almost surely, 2^221000012100 is an apocalyptic number.

221000012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221000012100 is an abundant number, since it is smaller than the sum of its proper divisors (592068517628).

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

221000012100 is a wasteful number, since it uses less digits than its factorization.

221000012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948155 (or 948145 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 221000012100 its reverse (1210000122), we get a palindrome (222210012222).

The spelling of 221000012100 in words is "two hundred twenty-one billion, twelve thousand, one hundred".