21216151301 has 4 divisors (see below), whose sum is σ = 21216617100. Its totient is φ = 21215685504.

The previous prime is 21216151291. The next prime is 21216151331. The reversal of 21216151301 is 10315161212.

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 1950988900 + 19265162401 = 44170^2 + 138799^2 .

It is a cyclic number.

It is not a de Polignac number, because 21216151301 - 2¹⁴ = 21216134917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216151331) 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, 156146 + ... + 258483.

It is an arithmetic number, because the mean of its divisors is an integer number (5304154275).

Almost surely, 2^21216151301 is an apocalyptic number.

It is an amenable number.

21216151301 is a deficient number, since it is larger than the sum of its proper divisors (465799).

21216151301 is an equidigital number, since it uses as much as digits as its factorization.

21216151301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465798.

The product of its (nonzero) digits is 360, while the sum is 23.

The spelling of 21216151301 in words is "twenty-one billion, two hundred sixteen million, one hundred fifty-one thousand, three hundred one".