21434510 has 8 divisors (see below), whose sum is σ = 38582136. Its totient is φ = 8573800.

The previous prime is 21434471. The next prime is 21434531. The reversal of 21434510 is 1543412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071716 + ... + 1071735.

It is an arithmetic number, because the mean of its divisors is an integer number (4822767).

Almost surely, 2^21434510 is an apocalyptic number.

21434510 is a deficient number, since it is larger than the sum of its proper divisors (17147626).

21434510 is a wasteful number, since it uses less digits than its factorization.

21434510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143458.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21434510 is about 4629.7418934537. The cubic root of 21434510 is about 277.7822683126.

Adding to 21434510 its reverse (1543412), we get a palindrome (22977922).

The spelling of 21434510 in words is "twenty-one million, four hundred thirty-four thousand, five hundred ten".