211221202202120 has 64 divisors (see below), whose sum is σ = 529482936326400. Its totient is φ = 75173503290880.

The previous prime is 211221202202081. The next prime is 211221202202137. The reversal of 211221202202120 is 21202202122112.

It is a super-2 number, since 2×211221202202120² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 211221202202092 and 211221202202101.

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, 5106874925 + ... + 5106916284.

It is an arithmetic number, because the mean of its divisors is an integer number (8273170880100).

Almost surely, 2^{211221202202120} is an apocalyptic number.

211221202202120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221202202120 is an abundant number, since it is smaller than the sum of its proper divisors (318261734124280).

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

211221202202120 is a wasteful number, since it uses less digits than its factorization.

211221202202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10213791278 (or 10213791274 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 211221202202120 its reverse (21202202122112), we get a palindrome (232423404324232).

The spelling of 211221202202120 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred two million, two hundred two thousand, one hundred twenty".