21454502 has 4 divisors (see below), whose sum is σ = 32181756. Its totient is φ = 10727250.

The previous prime is 21454483. The next prime is 21454541. The reversal of 21454502 is 20545412.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5363624 + ... + 5363627.

It is an arithmetic number, because the mean of its divisors is an integer number (8045439).

Almost surely, 2^21454502 is an apocalyptic number.

21454502 is a deficient number, since it is larger than the sum of its proper divisors (10727254).

21454502 is a wasteful number, since it uses less digits than its factorization.

21454502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10727253.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 21454502 is about 4631.9004738876. The cubic root of 21454502 is about 277.8686041240.

Adding to 21454502 its sum of digits (23), we get a triangular number (21454525 = T₆₅₅₀).

Adding to 21454502 its reverse (20545412), we get a palindrome (41999914).

The spelling of 21454502 in words is "twenty-one million, four hundred fifty-four thousand, five hundred two".