1201400220521 has 2 divisors, whose sum is σ = 1201400220522. Its totient is φ = 1201400220520.

The previous prime is 1201400220511. The next prime is 1201400220529. The reversal of 1201400220521 is 1250220041021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 666108984025 + 535291236496 = 816155^2 + 731636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201400220521 - 2⁶ = 1201400220457 is a prime.

It is a super-2 number, since 2×1201400220521² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1201400220493 and 1201400220502.

It is not a weakly prime, because it can be changed into another prime (1201400220529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600700110260 + 600700110261.

It is an arithmetic number, because the mean of its divisors is an integer number (600700110261).

Almost surely, 2^{1201400220521} is an apocalyptic number.

It is an amenable number.

1201400220521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201400220521 is an equidigital number, since it uses as much as digits as its factorization.

1201400220521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 1201400220521 its reverse (1250220041021), we get a palindrome (2451620261542).

The spelling of 1201400220521 in words is "one trillion, two hundred one billion, four hundred million, two hundred twenty thousand, five hundred twenty-one".