21216223653151 has 2 divisors, whose sum is σ = 21216223653152. Its totient is φ = 21216223653150.

The previous prime is 21216223653133. The next prime is 21216223653239. The reversal of 21216223653151 is 15135632261212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21216223653151 - 2³³ = 21207633718559 is a prime.

It is a super-2 number, since 2×21216223653151² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21216223654151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10608111826575 + 10608111826576.

It is an arithmetic number, because the mean of its divisors is an integer number (10608111826576).

Almost surely, 2^{21216223653151} is an apocalyptic number.

21216223653151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21216223653151 is an equidigital number, since it uses as much as digits as its factorization.

21216223653151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 40.

The spelling of 21216223653151 in words is "twenty-one trillion, two hundred sixteen billion, two hundred twenty-three million, six hundred fifty-three thousand, one hundred fifty-one".