2543421051021 has 16 divisors (see below), whose sum is σ = 3474216684288. Its totient is φ = 1654126291200.

The previous prime is 2543421051001. The next prime is 2543421051049. The reversal of 2543421051021 is 1201501243452.

It is not a de Polignac number, because 2543421051021 - 2⁶ = 2543421050957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2543421051021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543421051001) 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 in 15 ways as a sum of consecutive naturals, for example, 747436 + ... + 2376026.

It is an arithmetic number, because the mean of its divisors is an integer number (217138542768).

Almost surely, 2^{2543421051021} is an apocalyptic number.

It is an amenable number.

2543421051021 is a deficient number, since it is larger than the sum of its proper divisors (930795633267).

2543421051021 is a wasteful number, since it uses less digits than its factorization.

2543421051021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641332.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 2543421051021 its reverse (1201501243452), we get a palindrome (3744922294473).

The spelling of 2543421051021 in words is "two trillion, five hundred forty-three billion, four hundred twenty-one million, fifty-one thousand, twenty-one".