21101242994467 has 2 divisors, whose sum is σ = 21101242994468. Its totient is φ = 21101242994466.

The previous prime is 21101242994437. The next prime is 21101242994479. The reversal of 21101242994467 is 76449924210112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101242994467 is a prime.

It is a super-2 number, since 2×21101242994467² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21101242994437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550621497233 + 10550621497234.

It is an arithmetic number, because the mean of its divisors is an integer number (10550621497234).

Almost surely, 2^{21101242994467} is an apocalyptic number.

21101242994467 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101242994467 is an equidigital number, since it uses as much as digits as its factorization.

21101242994467 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 21101242994467 in words is "twenty-one trillion, one hundred one billion, two hundred forty-two million, nine hundred ninety-four thousand, four hundred sixty-seven".