1021201552541 has 2 divisors, whose sum is σ = 1021201552542. Its totient is φ = 1021201552540.

The previous prime is 1021201552493. The next prime is 1021201552543. The reversal of 1021201552541 is 1452551021201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 756501592441 + 264699960100 = 869771^2 + 514490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021201552541 - 2³⁸ = 746323645597 is a prime.

It is a super-2 number, since 2×1021201552541² (a number of 25 digits) contains 22 as substring.

Together with 1021201552543, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021201552543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510600776270 + 510600776271.

It is an arithmetic number, because the mean of its divisors is an integer number (510600776271).

Almost surely, 2^{1021201552541} is an apocalyptic number.

It is an amenable number.

1021201552541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021201552541 is an equidigital number, since it uses as much as digits as its factorization.

1021201552541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 1021201552541 its reverse (1452551021201), we get a palindrome (2473752573742).

The spelling of 1021201552541 in words is "one trillion, twenty-one billion, two hundred one million, five hundred fifty-two thousand, five hundred forty-one".