222121002100100 has 72 divisors (see below), whose sum is σ = 507380382243840. Its totient is φ = 84170634468480.

The previous prime is 222121002100079. The next prime is 222121002100103. The reversal of 222121002100100 is 1001200121222.

It is a super-2 number, since 2×222121002100100² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (222121002100103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105995069 + ... + 108070331.

Almost surely, 2^{222121002100100} is an apocalyptic number.

222121002100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222121002100100 is an abundant number, since it is smaller than the sum of its proper divisors (285259380143740).

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

222121002100100 is a wasteful number, since it uses less digits than its factorization.

222121002100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131629 (or 2131622 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 222121002100100 its reverse (1001200121222), we get a palindrome (223122202221322).

The spelling of 222121002100100 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two million, one hundred thousand, one hundred".