21034142503 has 4 divisors (see below), whose sum is σ = 22946337288. Its totient is φ = 19121947720.

The previous prime is 21034142501. The next prime is 21034142531. The reversal of 21034142503 is 30524143012.

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

It is a cyclic number.

It is not a de Polignac number, because 21034142503 - 2¹ = 21034142501 is a prime.

It is a super-2 number, since 2×21034142503² (a number of 21 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 (21034142501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956097376 + ... + 956097397.

It is an arithmetic number, because the mean of its divisors is an integer number (5736584322).

Almost surely, 2^21034142503 is an apocalyptic number.

21034142503 is a deficient number, since it is larger than the sum of its proper divisors (1912194785).

21034142503 is a wasteful number, since it uses less digits than its factorization.

21034142503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912194784.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21034142503 its reverse (30524143012), we get a palindrome (51558285515).

The spelling of 21034142503 in words is "twenty-one billion, thirty-four million, one hundred forty-two thousand, five hundred three".