21490894286 has 4 divisors (see below), whose sum is σ = 32236341432. Its totient is φ = 10745447142.

The previous prime is 21490894283. The next prime is 21490894351. The reversal of 21490894286 is 68249809412.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21490894283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5372723570 + ... + 5372723573.

It is an arithmetic number, because the mean of its divisors is an integer number (8059085358).

Almost surely, 2^21490894286 is an apocalyptic number.

21490894286 is a deficient number, since it is larger than the sum of its proper divisors (10745447146).

21490894286 is a wasteful number, since it uses less digits than its factorization.

21490894286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10745447145.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 21490894286 in words is "twenty-one billion, four hundred ninety million, eight hundred ninety-four thousand, two hundred eighty-six".