21124220223401 has 4 divisors (see below), whose sum is σ = 21311160225492. Its totient is φ = 20937280221312.

The previous prime is 21124220223383. The next prime is 21124220223409. The reversal of 21124220223401 is 10432202242112.

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 2 ways, for example, as 664420614400 + 20459799609001 = 815120^2 + 4523251^2 .

It is a cyclic number.

It is not a de Polignac number, because 21124220223401 - 2³⁴ = 21107040354217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124220223409) 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, 93470000876 + ... + 93470001101.

It is an arithmetic number, because the mean of its divisors is an integer number (5327790056373).

Almost surely, 2^{21124220223401} is an apocalyptic number.

It is an amenable number.

21124220223401 is a deficient number, since it is larger than the sum of its proper divisors (186940002091).

21124220223401 is a wasteful number, since it uses less digits than its factorization.

21124220223401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186940002090.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21124220223401 its reverse (10432202242112), we get a palindrome (31556422465513).

The spelling of 21124220223401 in words is "twenty-one trillion, one hundred twenty-four billion, two hundred twenty million, two hundred twenty-three thousand, four hundred one".