1021505220551 has 2 divisors, whose sum is σ = 1021505220552. Its totient is φ = 1021505220550.

The previous prime is 1021505220509. The next prime is 1021505220569. The reversal of 1021505220551 is 1550225051201.

It is a strong prime.

It is an emirp because it is prime and its reverse (1550225051201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021505220551 is a prime.

It is a super-2 number, since 2×1021505220551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021505220581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510752610275 + 510752610276.

It is an arithmetic number, because the mean of its divisors is an integer number (510752610276).

Almost surely, 2^{1021505220551} is an apocalyptic number.

1021505220551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021505220551 is an equidigital number, since it uses as much as digits as its factorization.

1021505220551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5000, while the sum is 29.

The spelling of 1021505220551 in words is "one trillion, twenty-one billion, five hundred five million, two hundred twenty thousand, five hundred fifty-one".