1211000220121 has 8 divisors (see below), whose sum is σ = 1233903844800. Its totient is φ = 1188098616432.

The previous prime is 1211000220119. The next prime is 1211000220127. The reversal of 1211000220121 is 1210220001121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211000220121 - 2¹ = 1211000220119 is a prime.

It is a super-2 number, since 2×1211000220121² (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 (1211000220127) 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, 732930 + ... + 1720228.

It is an arithmetic number, because the mean of its divisors is an integer number (154237980600).

Almost surely, 2^{1211000220121} is an apocalyptic number.

It is an amenable number.

1211000220121 is a deficient number, since it is larger than the sum of its proper divisors (22903624679).

1211000220121 is an equidigital number, since it uses as much as digits as its factorization.

1211000220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010495.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1211000220121 its reverse (1210220001121), we get a palindrome (2421220221242).

The spelling of 1211000220121 in words is "one trillion, two hundred eleven billion, two hundred twenty thousand, one hundred twenty-one".