21910143 has 16 divisors (see below), whose sum is σ = 29690496. Its totient is φ = 14370720.

The previous prime is 21910123. The next prime is 21910157. The reversal of 21910143 is 34101912.

It is not a de Polignac number, because 21910143 - 2⁵ = 21910111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21910123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77280 + ... + 77562.

It is an arithmetic number, because the mean of its divisors is an integer number (1855656).

Almost surely, 2^21910143 is an apocalyptic number.

21910143 is a deficient number, since it is larger than the sum of its proper divisors (7780353).

21910143 is a wasteful number, since it uses less digits than its factorization.

21910143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21910143 is about 4680.8271704903. The cubic root of 21910143 is about 279.8219233340.

The spelling of 21910143 in words is "twenty-one million, nine hundred ten thousand, one hundred forty-three".