21442802 has 4 divisors (see below), whose sum is σ = 32164206. Its totient is φ = 10721400.

The previous prime is 21442777. The next prime is 21442819. The reversal of 21442802 is 20824412.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 16248961 + 5193841 = 4031^2 + 2279^2 .

It is a super-2 number, since 2×21442802² = 919587515222408, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5360699 + ... + 5360702.

Almost surely, 2^21442802 is an apocalyptic number.

21442802 is a deficient number, since it is larger than the sum of its proper divisors (10721404).

21442802 is a wasteful number, since it uses less digits than its factorization.

21442802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10721403.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 21442802 is about 4630.6373211471. The cubic root of 21442802 is about 277.8180839764.

The spelling of 21442802 in words is "twenty-one million, four hundred forty-two thousand, eight hundred two".