211219999947 has 32 divisors (see below), whose sum is σ = 341761628160. Its totient is φ = 127863632160.

The previous prime is 211219999891. The next prime is 211219999951. The reversal of 211219999947 is 749999912112.

It is not a de Polignac number, because 211219999947 - 2¹² = 211219995851 is a prime.

It is a super-2 number, since 2×211219999947² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211219999987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155728 + ... + 668349.

It is an arithmetic number, because the mean of its divisors is an integer number (10680050880).

Almost surely, 2^211219999947 is an apocalyptic number.

211219999947 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

211219999947 is a deficient number, since it is larger than the sum of its proper divisors (130541628213).

211219999947 is a wasteful number, since it uses less digits than its factorization.

211219999947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824960 (or 824954 counting only the distinct ones).

The product of its digits is 6613488, while the sum is 63.

The spelling of 211219999947 in words is "two hundred eleven billion, two hundred nineteen million, nine hundred ninety-nine thousand, nine hundred forty-seven".