1201211021 has 2 divisors, whose sum is σ = 1201211022. Its totient is φ = 1201211020.

The previous prime is 1201211009. The next prime is 1201211069. The reversal of 1201211021 is 1201121021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1052029225 + 149181796 = 32435^2 + 12214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201211021 is a prime.

It is a super-3 number, since 3×1201211021³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1201210993 and 1201211011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201211821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600605510 + 600605511.

It is an arithmetic number, because the mean of its divisors is an integer number (600605511).

Almost surely, 2^1201211021 is an apocalyptic number.

It is an amenable number.

1201211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201211021 is an equidigital number, since it uses as much as digits as its factorization.

1201211021 is an evil number, because the sum of its binary digits is even.

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

The square root of 1201211021 is about 34658.4913260805. The cubic root of 1201211021 is about 1063.0159217322.

Adding to 1201211021 its reverse (1201121021), we get a palindrome (2402332042).

Subtracting from 1201211021 its reverse (1201121021), we obtain a square (90000 = 300²).

The spelling of 1201211021 in words is "one billion, two hundred one million, two hundred eleven thousand, twenty-one".