1021225356551 has 4 divisors (see below), whose sum is σ = 1021227665592. Its totient is φ = 1021223047512.

The previous prime is 1021225356533. The next prime is 1021225356553. The reversal of 1021225356551 is 1556535221201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021225356551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021225356553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260180 + ... + 1452633.

It is an arithmetic number, because the mean of its divisors is an integer number (255306916398).

Almost surely, 2^{1021225356551} is an apocalyptic number.

1021225356551 is a deficient number, since it is larger than the sum of its proper divisors (2309041).

1021225356551 is an equidigital number, since it uses as much as digits as its factorization.

1021225356551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309040.

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 1021225356551 in words is "one trillion, twenty-one billion, two hundred twenty-five million, three hundred fifty-six thousand, five hundred fifty-one".