1101201121621 has 2 divisors, whose sum is σ = 1101201121622. Its totient is φ = 1101201121620.

The previous prime is 1101201121589. The next prime is 1101201121693. The reversal of 1101201121621 is 1261211021011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 846241767396 + 254959354225 = 919914^2 + 504935^2 .

It is an emirp because it is prime and its reverse (1261211021011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1101201121621 - 2⁵ = 1101201121589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101201121921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550600560810 + 550600560811.

It is an arithmetic number, because the mean of its divisors is an integer number (550600560811).

Almost surely, 2^{1101201121621} is an apocalyptic number.

It is an amenable number.

1101201121621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101201121621 is an equidigital number, since it uses as much as digits as its factorization.

1101201121621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 1101201121621 its reverse (1261211021011), we get a palindrome (2362412142632).

The spelling of 1101201121621 in words is "one trillion, one hundred one billion, two hundred one million, one hundred twenty-one thousand, six hundred twenty-one".