1211000210021 has 8 divisors (see below), whose sum is σ = 1456842358080. Its totient is φ = 983368591488.

The previous prime is 1211000209987. The next prime is 1211000210027. The reversal of 1211000210021 is 1200120001121.

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 1211000210021 - 2⁶ = 1211000209957 is a prime.

It is a super-2 number, since 2×1211000210021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

1211000210021 is a modest number, since divided by 210021 gives 12110 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1211000209984 and 1211000210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211000210027) 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, 4552632236 + ... + 4552632501.

It is an arithmetic number, because the mean of its divisors is an integer number (182105294760).

Almost surely, 2^{1211000210021} is an apocalyptic number.

It is an amenable number.

1211000210021 is a deficient number, since it is larger than the sum of its proper divisors (245842148059).

1211000210021 is an equidigital number, since it uses as much as digits as its factorization.

1211000210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9105264763.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1211000210021 its reverse (1200120001121), we get a palindrome (2411120211142).

The spelling of 1211000210021 in words is "one trillion, two hundred eleven billion, two hundred ten thousand, twenty-one".