2154302050021 has 4 divisors (see below), whose sum is σ = 2350147690944. Its totient is φ = 1958456409100.

The previous prime is 2154302050007. The next prime is 2154302050039. The reversal of 2154302050021 is 1200502034512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2154302050021 - 2³³ = 2145712115429 is a prime.

It is a super-2 number, since 2×2154302050021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154302050001) 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, 97922820445 + ... + 97922820466.

It is an arithmetic number, because the mean of its divisors is an integer number (587536922736).

Almost surely, 2^{2154302050021} is an apocalyptic number.

It is an amenable number.

2154302050021 is a deficient number, since it is larger than the sum of its proper divisors (195845640923).

2154302050021 is a wasteful number, since it uses less digits than its factorization.

2154302050021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195845640922.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 2154302050021 its reverse (1200502034512), we get a palindrome (3354804084533).

The spelling of 2154302050021 in words is "two trillion, one hundred fifty-four billion, three hundred two million, fifty thousand, twenty-one".