22012004020421 has 4 divisors (see below), whose sum is σ = 22018353029952. Its totient is φ = 22005655010892.

The previous prime is 22012004020393. The next prime is 22012004020427. The reversal of 22012004020421 is 12402040021022.

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 a de Polignac number, because none of the positive numbers 2^k-22012004020421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22012004020393 and 22012004020402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012004020427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3174499565 + ... + 3174506498.

It is an arithmetic number, because the mean of its divisors is an integer number (5504588257488).

Almost surely, 2^{22012004020421} is an apocalyptic number.

It is an amenable number.

22012004020421 is a deficient number, since it is larger than the sum of its proper divisors (6349009531).

22012004020421 is an equidigital number, since it uses as much as digits as its factorization.

22012004020421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6349009530.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 22012004020421 its reverse (12402040021022), we get a palindrome (34414044041443).

The spelling of 22012004020421 in words is "twenty-two trillion, twelve billion, four million, twenty thousand, four hundred twenty-one".