102011011111621 has 2 divisors, whose sum is σ = 102011011111622. Its totient is φ = 102011011111620.

The previous prime is 102011011111573. The next prime is 102011011111631. The reversal of 102011011111621 is 126111110110201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53834723956225 + 48176287155396 = 7337215^2 + 6940914^2 .

It is a cyclic number.

It is not a de Polignac number, because 102011011111621 - 2⁹ = 102011011111109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102011011111631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51005505555810 + 51005505555811.

It is an arithmetic number, because the mean of its divisors is an integer number (51005505555811).

Almost surely, 2^{102011011111621} is an apocalyptic number.

It is an amenable number.

102011011111621 is a deficient number, since it is larger than the sum of its proper divisors (1).

102011011111621 is an equidigital number, since it uses as much as digits as its factorization.

102011011111621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 19.

Adding to 102011011111621 its reverse (126111110110201), we get a palindrome (228122121221822).

The spelling of 102011011111621 in words is "one hundred two trillion, eleven billion, eleven million, one hundred eleven thousand, six hundred twenty-one".