21431062 has 4 divisors (see below), whose sum is σ = 32146596. Its totient is φ = 10715530.

The previous prime is 21431057. The next prime is 21431063. The reversal of 21431062 is 26013412.

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 (21431063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5357764 + ... + 5357767.

It is an arithmetic number, because the mean of its divisors is an integer number (8036649).

Almost surely, 2^21431062 is an apocalyptic number.

21431062 is a deficient number, since it is larger than the sum of its proper divisors (10715534).

21431062 is a wasteful number, since it uses less digits than its factorization.

21431062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10715533.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21431062 is about 4629.3695035069. The cubic root of 21431062 is about 277.7673726354.

Adding to 21431062 its reverse (26013412), we get a palindrome (47444474).

The spelling of 21431062 in words is "twenty-one million, four hundred thirty-one thousand, sixty-two".