21002021994727 has 2 divisors, whose sum is σ = 21002021994728. Its totient is φ = 21002021994726.

The previous prime is 21002021994703. The next prime is 21002021994731. The reversal of 21002021994727 is 72749912020012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002021994727 - 2³⁹ = 20452266180839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002021974727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501010997363 + 10501010997364.

It is an arithmetic number, because the mean of its divisors is an integer number (10501010997364).

Almost surely, 2^{21002021994727} is an apocalyptic number.

21002021994727 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002021994727 is an equidigital number, since it uses as much as digits as its factorization.

21002021994727 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 21002021994727 in words is "twenty-one trillion, two billion, twenty-one million, nine hundred ninety-four thousand, seven hundred twenty-seven".