211203209978 has 24 divisors (see below), whose sum is σ = 341889027228. Its totient is φ = 97514423552.

The previous prime is 211203209977. The next prime is 211203209983. The reversal of 211203209978 is 879902302112.

It can be written as a sum of positive squares in 6 ways, for example, as 148037949049 + 63165260929 = 384757^2 + 251327^2 .

It is a super-2 number, since 2×211203209978² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211203209977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1010201 + ... + 1201212.

Almost surely, 2^211203209978 is an apocalyptic number.

211203209978 is a deficient number, since it is larger than the sum of its proper divisors (130685817250).

211203209978 is a wasteful number, since it uses less digits than its factorization.

211203209978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211538 (or 2211485 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 211203209978 in words is "two hundred eleven billion, two hundred three million, two hundred nine thousand, nine hundred seventy-eight".