21222020316251 has 8 divisors (see below), whose sum is σ = 21227013508800. Its totient is φ = 21217027537728.

The previous prime is 21222020316229. The next prime is 21222020316311. The reversal of 21222020316251 is 15261302022212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21222020316251 - 2⁶ = 21222020316187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222020316221) 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, 117864545 + ... + 118044461.

It is an arithmetic number, because the mean of its divisors is an integer number (2653376688600).

Almost surely, 2^{21222020316251} is an apocalyptic number.

21222020316251 is a deficient number, since it is larger than the sum of its proper divisors (4993192549).

21222020316251 is a wasteful number, since it uses less digits than its factorization.

21222020316251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207013.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21222020316251 its reverse (15261302022212), we get a palindrome (36483322338463).

The spelling of 21222020316251 in words is "twenty-one trillion, two hundred twenty-two billion, twenty million, three hundred sixteen thousand, two hundred fifty-one".