21400413221 has 4 divisors (see below), whose sum is σ = 23345905344. Its totient is φ = 19454921100.

The previous prime is 21400413197. The next prime is 21400413269. The reversal of 21400413221 is 12231400412.

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 21400413221 - 2¹⁰ = 21400412197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21400413193 and 21400413202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400413121) 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, 972746045 + ... + 972746066.

It is an arithmetic number, because the mean of its divisors is an integer number (5836476336).

Almost surely, 2^21400413221 is an apocalyptic number.

It is an amenable number.

21400413221 is a deficient number, since it is larger than the sum of its proper divisors (1945492123).

21400413221 is a wasteful number, since it uses less digits than its factorization.

21400413221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945492122.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21400413221 its reverse (12231400412), we get a palindrome (33631813633).

The spelling of 21400413221 in words is "twenty-one billion, four hundred million, four hundred thirteen thousand, two hundred twenty-one".