2121201001220 has 24 divisors (see below), whose sum is σ = 5090882403264. Its totient is φ = 727268914656.

The previous prime is 2121201001207. The next prime is 2121201001229. The reversal of 2121201001220 is 221001021212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 2121201001195 and 2121201001204.

It is not an unprimeable number, because it can be changed into a prime (2121201001229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7575717722 + ... + 7575718001.

It is an arithmetic number, because the mean of its divisors is an integer number (212120100136).

Almost surely, 2^{2121201001220} is an apocalyptic number.

2121201001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121201001220 is an abundant number, since it is smaller than the sum of its proper divisors (2969681402044).

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

2121201001220 is a wasteful number, since it uses less digits than its factorization.

2121201001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15151435739 (or 15151435737 counting only the distinct ones).

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

Adding to 2121201001220 its reverse (221001021212), we get a palindrome (2342202022432).

The spelling of 2121201001220 in words is "two trillion, one hundred twenty-one billion, two hundred one million, one thousand, two hundred twenty".