211221211201220 has 48 divisors (see below), whose sum is σ = 487093153228416. Its totient is φ = 76299052800000.

The previous prime is 211221211201219. The next prime is 211221211201237. The reversal of 211221211201220 is 22102112122112.

It is a super-2 number, since 2×211221211201220² (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 = 211221211201192 and 211221211201201.

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, 3179093981 + ... + 3179160420.

It is an arithmetic number, because the mean of its divisors is an integer number (10147774025592).

Almost surely, 2^{211221211201220} is an apocalyptic number.

211221211201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221211201220 is an abundant number, since it is smaller than the sum of its proper divisors (275871942027196).

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

211221211201220 is a wasteful number, since it uses less digits than its factorization.

211221211201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6358254572 (or 6358254570 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211221211201220 its reverse (22102112122112), we get a palindrome (233323323323332).

The spelling of 211221211201220 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred one thousand, two hundred twenty".