22102421 has 4 divisors (see below), whose sum is σ = 24111744. Its totient is φ = 20093100.

The previous prime is 22102417. The next prime is 22102427. The reversal of 22102421 is 12420122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22102421 - 2² = 22102417 is a prime.

It is a super-3 number, since 3×22102421³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22102396 and 22102405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22102427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1004645 + ... + 1004666.

It is an arithmetic number, because the mean of its divisors is an integer number (6027936).

Almost surely, 2^22102421 is an apocalyptic number.

It is an amenable number.

22102421 is a deficient number, since it is larger than the sum of its proper divisors (2009323).

22102421 is a wasteful number, since it uses less digits than its factorization.

22102421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009322.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 22102421 is about 4701.3211972806. The cubic root of 22102421 is about 280.6380898255.

Adding to 22102421 its reverse (12420122), we get a palindrome (34522543).

The spelling of 22102421 in words is "twenty-two million, one hundred two thousand, four hundred twenty-one".