212021077554 has 128 divisors (see below), whose sum is σ = 567029756160. Its totient is φ = 57860006400.

The previous prime is 212021077553. The next prime is 212021077591. The reversal of 212021077554 is 455770120212.

212021077554 is a `hidden beast` number, since 2 + 1 + 20 + 2 + 10 + 77 + 554 = 666.

212021077554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×212021077554³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (212021077553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18237 + ... + 651440.

It is an arithmetic number, because the mean of its divisors is an integer number (4429919970).

Almost surely, 2^212021077554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212021077554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283514878080).

212021077554 is an abundant number, since it is smaller than the sum of its proper divisors (355008678606).

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

212021077554 is a wasteful number, since it uses less digits than its factorization.

212021077554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669753 (or 669747 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

Adding to 212021077554 its reverse (455770120212), we get a palindrome (667791197766).

The spelling of 212021077554 in words is "two hundred twelve billion, twenty-one million, seventy-seven thousand, five hundred fifty-four".