21010143 has 32 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 10337760.

The previous prime is 21010127. The next prime is 21010153. The reversal of 21010143 is 34101012.

It is a happy number.

It is not a de Polignac number, because 21010143 - 2⁴ = 21010127 is a prime.

It is a super-2 number, since 2×21010143² = 882852217760898, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1996 + ... + 6782.

It is an arithmetic number, because the mean of its divisors is an integer number (1149120).

Almost surely, 2^21010143 is an apocalyptic number.

21010143 is a deficient number, since it is larger than the sum of its proper divisors (15761697).

21010143 is a wasteful number, since it uses less digits than its factorization.

21010143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4827.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21010143 is about 4583.6822533854. The cubic root of 21010143 is about 275.9368291679.

Adding to 21010143 its reverse (34101012), we get a palindrome (55111155).

The spelling of 21010143 in words is "twenty-one million, ten thousand, one hundred forty-three".