211687939428 has 48 divisors (see below), whose sum is σ = 572926577664. Its totient is φ = 59579546400.

The previous prime is 211687939423. The next prime is 211687939447. The reversal of 211687939428 is 824939786112.

It is not an unprimeable number, because it can be changed into a prime (211687939423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18801048 + ... + 18812303.

It is an arithmetic number, because the mean of its divisors is an integer number (11935970368).

Almost surely, 2^211687939428 is an apocalyptic number.

211687939428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

211687939428 is an abundant number, since it is smaller than the sum of its proper divisors (361238638236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211687939428 is a wasteful number, since it uses less digits than its factorization.

211687939428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37613432 (or 37613430 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The spelling of 211687939428 in words is "two hundred eleven billion, six hundred eighty-seven million, nine hundred thirty-nine thousand, four hundred twenty-eight".