1211010010121 has 4 divisors (see below), whose sum is σ = 1211146286592. Its totient is φ = 1210873733652.

The previous prime is 1211010010087. The next prime is 1211010010141. The reversal of 1211010010121 is 1210100101121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211010010121 - 2⁶ = 1211010010057 is a prime.

It is a super-2 number, since 2×1211010010121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211010010141) 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 3 ways as a sum of consecutive naturals, for example, 68124905 + ... + 68142678.

It is an arithmetic number, because the mean of its divisors is an integer number (302786571648).

Almost surely, 2^{1211010010121} is an apocalyptic number.

It is an amenable number.

1211010010121 is a deficient number, since it is larger than the sum of its proper divisors (136276471).

1211010010121 is an equidigital number, since it uses as much as digits as its factorization.

1211010010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136276470.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1211010010121 its reverse (1210100101121), we get a palindrome (2421110111242).

The spelling of 1211010010121 in words is "one trillion, two hundred eleven billion, ten million, ten thousand, one hundred twenty-one".