212140401781 has 48 divisors (see below), whose sum is σ = 274575942144. Its totient is φ = 160335648000.

The previous prime is 212140401779. The next prime is 212140401817. The reversal of 212140401781 is 187104041212.

It is not a de Polignac number, because 212140401781 - 2¹ = 212140401779 is a prime.

It is a super-2 number, since 2×212140401781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212140401761) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5990116 + ... + 6025426.

It is an arithmetic number, because the mean of its divisors is an integer number (5720332128).

Almost surely, 2^212140401781 is an apocalyptic number.

It is an amenable number.

212140401781 is a deficient number, since it is larger than the sum of its proper divisors (62435540363).

212140401781 is a wasteful number, since it uses less digits than its factorization.

212140401781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35554 (or 35543 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

Adding to 212140401781 its reverse (187104041212), we get a palindrome (399244442993).

The spelling of 212140401781 in words is "two hundred twelve billion, one hundred forty million, four hundred one thousand, seven hundred eighty-one".