22211220421 has 8 divisors (see below), whose sum is σ = 23965694424. Its totient is φ = 20463306240.

The previous prime is 22211220407. The next prime is 22211220439. The reversal of 22211220421 is 12402211222.

It can be written as a sum of positive squares in 4 ways, for example, as 2033017921 + 20178202500 = 45089^2 + 142050^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22211220421 - 2⁷ = 22211220293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211220491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632916 + ... + 1646461.

It is an arithmetic number, because the mean of its divisors is an integer number (2995711803).

Almost surely, 2^22211220421 is an apocalyptic number.

It is an amenable number.

22211220421 is a deficient number, since it is larger than the sum of its proper divisors (1754474003).

22211220421 is a wasteful number, since it uses less digits than its factorization.

22211220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279911.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 22211220421 its reverse (12402211222), we get a palindrome (34613431643).

The spelling of 22211220421 in words is "twenty-two billion, two hundred eleven million, two hundred twenty thousand, four hundred twenty-one".