21602054 has 4 divisors (see below), whose sum is σ = 32403084. Its totient is φ = 10801026.

The previous prime is 21602041. The next prime is 21602059. The reversal of 21602054 is 45020612.

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 (21602059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5400512 + ... + 5400515.

It is an arithmetic number, because the mean of its divisors is an integer number (8100771).

Almost surely, 2^21602054 is an apocalyptic number.

21602054 is a deficient number, since it is larger than the sum of its proper divisors (10801030).

21602054 is a wasteful number, since it uses less digits than its factorization.

21602054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10801029.

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

The square root of 21602054 is about 4647.8009854123. The cubic root of 21602054 is about 278.5041573513.

Adding to 21602054 its reverse (45020612), we get a palindrome (66622666).

The spelling of 21602054 in words is "twenty-one million, six hundred two thousand, fifty-four".