1211211011021 has 16 divisors (see below), whose sum is σ = 1349498292480. Its totient is φ = 1077622150080.

The previous prime is 1211211011009. The next prime is 1211211011029. The reversal of 1211211011021 is 1201101121121.

It is a cyclic number.

It is not a de Polignac number, because 1211211011021 - 2²² = 1211206816717 is a prime.

It is a super-2 number, since 2×1211211011021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211211010987 and 1211211011005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211211011029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14594375 + ... + 14677131.

It is an arithmetic number, because the mean of its divisors is an integer number (84343643280).

Almost surely, 2^{1211211011021} is an apocalyptic number.

1211211011021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211211011021 is a deficient number, since it is larger than the sum of its proper divisors (138287281459).

1211211011021 is a wasteful number, since it uses less digits than its factorization.

1211211011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111124.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211211011021 its reverse (1201101121121), we get a palindrome (2412312132142).

The spelling of 1211211011021 in words is "one trillion, two hundred eleven billion, two hundred eleven million, eleven thousand, twenty-one".