21234502 has 4 divisors (see below), whose sum is σ = 31851756. Its totient is φ = 10617250.

The previous prime is 21234487. The next prime is 21234509. The reversal of 21234502 is 20543212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21234502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308624 + ... + 5308627.

It is an arithmetic number, because the mean of its divisors is an integer number (7962939).

Almost surely, 2^21234502 is an apocalyptic number.

21234502 is a deficient number, since it is larger than the sum of its proper divisors (10617254).

21234502 is a wasteful number, since it uses less digits than its factorization.

21234502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10617253.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21234502 is about 4608.0909279223. The cubic root of 21234502 is about 276.9155602858.

Adding to 21234502 its reverse (20543212), we get a palindrome (41777714).

It can be divided in two parts, 21234 and 502, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 21234502 in words is "twenty-one million, two hundred thirty-four thousand, five hundred two".