211220121012 has 24 divisors (see below), whose sum is σ = 492878920800. Its totient is φ = 70402139616.

The previous prime is 211220121001. The next prime is 211220121023. The reversal of 211220121012 is 210121022112.

211220121012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (211220121001) and next prime (211220121023).

It is a super-2 number, since 2×211220121012² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211220120982 and 211220121000.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 375562 + ... + 750657.

It is an arithmetic number, because the mean of its divisors is an integer number (20536621700).

Almost surely, 2^211220121012 is an apocalyptic number.

It is an amenable number.

211220121012 is an abundant number, since it is smaller than the sum of its proper divisors (281658799788).

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

211220121012 is a wasteful number, since it uses less digits than its factorization.

211220121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141855 (or 1141853 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211220121012 its reverse (210121022112), we get a palindrome (421341143124).

The spelling of 211220121012 in words is "two hundred eleven billion, two hundred twenty million, one hundred twenty-one thousand, twelve".