211525401947 has 2 divisors, whose sum is σ = 211525401948. Its totient is φ = 211525401946.

The previous prime is 211525401889. The next prime is 211525401979. The reversal of 211525401947 is 749104525112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211525401947 - 2¹⁰ = 211525400923 is a prime.

It is a super-2 number, since 2×211525401947² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211525401847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105762700973 + 105762700974.

It is an arithmetic number, because the mean of its divisors is an integer number (105762700974).

Almost surely, 2^211525401947 is an apocalyptic number.

211525401947 is a deficient number, since it is larger than the sum of its proper divisors (1).

211525401947 is an equidigital number, since it uses as much as digits as its factorization.

211525401947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 211525401947 in words is "two hundred eleven billion, five hundred twenty-five million, four hundred one thousand, nine hundred forty-seven".