1021402045551 has 4 divisors (see below), whose sum is σ = 1361869394072. Its totient is φ = 680934697032.

The previous prime is 1021402045487. The next prime is 1021402045553. The reversal of 1021402045551 is 1555402041201.

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

It is not a de Polignac number, because 1021402045551 - 2⁶ = 1021402045487 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 (1021402045553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170233674256 + ... + 170233674261.

It is an arithmetic number, because the mean of its divisors is an integer number (340467348518).

Almost surely, 2^{1021402045551} is an apocalyptic number.

1021402045551 is a deficient number, since it is larger than the sum of its proper divisors (340467348521).

1021402045551 is an equidigital number, since it uses as much as digits as its factorization.

1021402045551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340467348520.

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 1021402045551 its reverse (1555402041201), we get a palindrome (2576804086752).

The spelling of 1021402045551 in words is "one trillion, twenty-one billion, four hundred two million, forty-five thousand, five hundred fifty-one".