211957282890 has 24 divisors (see below), whose sum is σ = 551088935748. Its totient is φ = 56521942080.

The previous prime is 211957282829. The next prime is 211957282913. The reversal of 211957282890 is 98282759112.

It can be written as a sum of positive squares in 2 ways, for example, as 172368619929 + 39588662961 = 415173^2 + 198969^2 .

It is a super-2 number, since 2×211957282890² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1177540371 + ... + 1177540550.

Almost surely, 2^211957282890 is an apocalyptic number.

211957282890 is an abundant number, since it is smaller than the sum of its proper divisors (339131652858).

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

211957282890 is a wasteful number, since it uses less digits than its factorization.

211957282890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355080934 (or 2355080931 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 211957282890 in words is "two hundred eleven billion, nine hundred fifty-seven million, two hundred eighty-two thousand, eight hundred ninety".