21002100021143 has 2 divisors, whose sum is σ = 21002100021144. Its totient is φ = 21002100021142.

The previous prime is 21002100021103. The next prime is 21002100021179. The reversal of 21002100021143 is 34112000120012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002100021143 - 2¹⁸ = 21002099758999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002100021103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501050010571 + 10501050010572.

It is an arithmetic number, because the mean of its divisors is an integer number (10501050010572).

Almost surely, 2^{21002100021143} is an apocalyptic number.

21002100021143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002100021143 is an equidigital number, since it uses as much as digits as its factorization.

21002100021143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21002100021143 its reverse (34112000120012), we get a palindrome (55114100141155).

The spelling of 21002100021143 in words is "twenty-one trillion, two billion, one hundred million, twenty-one thousand, one hundred forty-three".