21220101212971 has 2 divisors, whose sum is σ = 21220101212972. Its totient is φ = 21220101212970.

The previous prime is 21220101212939. The next prime is 21220101213001. The reversal of 21220101212971 is 17921210102212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220101212971 - 2⁵ = 21220101212939 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220101212911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610050606485 + 10610050606486.

It is an arithmetic number, because the mean of its divisors is an integer number (10610050606486).

Almost surely, 2^{21220101212971} is an apocalyptic number.

21220101212971 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220101212971 is an equidigital number, since it uses as much as digits as its factorization.

21220101212971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 21220101212971 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, two hundred twelve thousand, nine hundred seventy-one".