21012011122212 has 96 divisors (see below), whose sum is σ = 59428996099200. Its totient is φ = 6367159756800.

The previous prime is 21012011122189. The next prime is 21012011122229. The reversal of 21012011122212 is 21222111021012.

21012011122212 is a `hidden beast` number, since 210 + 120 + 1 + 1 + 122 + 212 = 666.

It is a super-2 number, since 2×21012011122212² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82806412 + ... + 83059772.

It is an arithmetic number, because the mean of its divisors is an integer number (619052042700).

Almost surely, 2^{21012011122212} is an apocalyptic number.

21012011122212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21012011122212 is an abundant number, since it is smaller than the sum of its proper divisors (38416984976988).

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

21012011122212 is a wasteful number, since it uses less digits than its factorization.

21012011122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323194 (or 323186 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21012011122212 its reverse (21222111021012), we get a palindrome (42234122143224).

The spelling of 21012011122212 in words is "twenty-one trillion, twelve billion, eleven million, one hundred twenty-two thousand, two hundred twelve".