21221353412051 has 8 divisors (see below), whose sum is σ = 23284968330960. Its totient is φ = 19219338938592.

The previous prime is 21221353412011. The next prime is 21221353412071. The reversal of 21221353412051 is 15021435312212.

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

It is a de Polignac number, because none of the positive numbers 2^k-21221353412051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221353411999 and 21221353412017.

It is not an unprimeable number, because it can be changed into a prime (21221353412011) 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, 15400110641 + ... + 15400112018.

It is an arithmetic number, because the mean of its divisors is an integer number (2910621041370).

Almost surely, 2^{21221353412051} is an apocalyptic number.

21221353412051 is a deficient number, since it is larger than the sum of its proper divisors (2063614918909).

21221353412051 is a wasteful number, since it uses less digits than its factorization.

21221353412051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30800222725.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21221353412051 its reverse (15021435312212), we get a palindrome (36242788724263).

The spelling of 21221353412051 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred fifty-three million, four hundred twelve thousand, fifty-one".