21223932206401 has 4 divisors (see below), whose sum is σ = 21267513176512. Its totient is φ = 21180351236292.

The previous prime is 21223932206387. The next prime is 21223932206429. The reversal of 21223932206401 is 10460223932212.

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 21223932206401 - 2⁴³ = 12427839184193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223932206461) 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, 21790484325 + ... + 21790485298.

It is an arithmetic number, because the mean of its divisors is an integer number (5316878294128).

Almost surely, 2^{21223932206401} is an apocalyptic number.

It is an amenable number.

21223932206401 is a deficient number, since it is larger than the sum of its proper divisors (43580970111).

21223932206401 is an equidigital number, since it uses as much as digits as its factorization.

21223932206401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43580970110.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 21223932206401 in words is "twenty-one trillion, two hundred twenty-three billion, nine hundred thirty-two million, two hundred six thousand, four hundred one".