21443152651 has 2 divisors, whose sum is σ = 21443152652. Its totient is φ = 21443152650.

The previous prime is 21443152603. The next prime is 21443152681. The reversal of 21443152651 is 15625134412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21443152651 - 2⁹ = 21443152139 is a prime.

It is a super-2 number, since 2×21443152651² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21443152681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721576325 + 10721576326.

It is an arithmetic number, because the mean of its divisors is an integer number (10721576326).

Almost surely, 2^21443152651 is an apocalyptic number.

21443152651 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443152651 is an equidigital number, since it uses as much as digits as its factorization.

21443152651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 34.

The spelling of 21443152651 in words is "twenty-one billion, four hundred forty-three million, one hundred fifty-two thousand, six hundred fifty-one".