21842902 has 4 divisors (see below), whose sum is σ = 32764356. Its totient is φ = 10921450.

The previous prime is 21842881. The next prime is 21842903. The reversal of 21842902 is 20924812.

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

It is a super-2 number, since 2×21842902² = 954224735563208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21842903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5460724 + ... + 5460727.

It is an arithmetic number, because the mean of its divisors is an integer number (8191089).

Almost surely, 2^21842902 is an apocalyptic number.

21842902 is a deficient number, since it is larger than the sum of its proper divisors (10921454).

21842902 is a wasteful number, since it uses less digits than its factorization.

21842902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10921453.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21842902 is about 4673.6390532432. The cubic root of 21842902 is about 279.5353774065.

The spelling of 21842902 in words is "twenty-one million, eight hundred forty-two thousand, nine hundred two".