211867812051 has 72 divisors (see below), whose sum is σ = 337550421312. Its totient is φ = 117859190400.

The previous prime is 211867812001. The next prime is 211867812053. The reversal of 211867812051 is 150218768112.

It is not a de Polignac number, because 211867812051 - 2¹⁹ = 211867287763 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211867811994 and 211867812012.

It is not an unprimeable number, because it can be changed into a prime (211867812053) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 218194996 + ... + 218195966.

It is an arithmetic number, because the mean of its divisors is an integer number (4688200296).

Almost surely, 2^211867812051 is an apocalyptic number.

211867812051 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

211867812051 is a deficient number, since it is larger than the sum of its proper divisors (125682609261).

211867812051 is an equidigital number, since it uses as much as digits as its factorization.

211867812051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953 (or 1905 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 42.

The spelling of 211867812051 in words is "two hundred eleven billion, eight hundred sixty-seven million, eight hundred twelve thousand, fifty-one".