21020143434103 has 32 divisors (see below), whose sum is σ = 24212865600000. Its totient is φ = 18047321147520.

The previous prime is 21020143434079. The next prime is 21020143434151. The reversal of 21020143434103 is 30143434102012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21020143434103 - 2²⁹ = 21019606563191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020143434803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 329442598 + ... + 329506396.

It is an arithmetic number, because the mean of its divisors is an integer number (756652050000).

Almost surely, 2^{21020143434103} is an apocalyptic number.

21020143434103 is a deficient number, since it is larger than the sum of its proper divisors (3192722165897).

21020143434103 is a wasteful number, since it uses less digits than its factorization.

21020143434103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68695.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21020143434103 its reverse (30143434102012), we get a palindrome (51163577536115).

The spelling of 21020143434103 in words is "twenty-one trillion, twenty billion, one hundred forty-three million, four hundred thirty-four thousand, one hundred three".