1211210121020 has 12 divisors (see below), whose sum is σ = 2543541254184. Its totient is φ = 484484048400.

The previous prime is 1211210120993. The next prime is 1211210121041. The reversal of 1211210121020 is 201210121121.

It is a super-2 number, since 2×1211210121020² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211210120986 and 1211210121004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30280253006 + ... + 30280253045.

It is an arithmetic number, because the mean of its divisors is an integer number (211961771182).

Almost surely, 2^{1211210121020} is an apocalyptic number.

1211210121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211210121020 is an abundant number, since it is smaller than the sum of its proper divisors (1332331133164).

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

1211210121020 is a wasteful number, since it uses less digits than its factorization.

1211210121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60560506060 (or 60560506058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211210121020 its reverse (201210121121), we get a palindrome (1412420242141).

It can be divided in two parts, 12112101 and 21020, that added together give a palindrome (12133121).

The spelling of 1211210121020 in words is "one trillion, two hundred eleven billion, two hundred ten million, one hundred twenty-one thousand, twenty".