21220101111947 has 2 divisors, whose sum is σ = 21220101111948. Its totient is φ = 21220101111946.

The previous prime is 21220101111931. The next prime is 21220101111961. The reversal of 21220101111947 is 74911110102212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220101111947 - 2⁴ = 21220101111931 is a prime.

It is a super-2 number, since 2×21220101111947² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21220101111907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610050555973 + 10610050555974.

It is an arithmetic number, because the mean of its divisors is an integer number (10610050555974).

Almost surely, 2^{21220101111947} is an apocalyptic number.

21220101111947 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220101111947 is an equidigital number, since it uses as much as digits as its factorization.

21220101111947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 32.

The spelling of 21220101111947 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, one hundred eleven thousand, nine hundred forty-seven".