21012212122122 has 64 divisors (see below), whose sum is σ = 46718519823360. Its totient is φ = 6256531584000.

The previous prime is 21012212122117. The next prime is 21012212122127. The reversal of 21012212122122 is 22122121221012.

It is an interprime number because it is at equal distance from previous prime (21012212122117) and next prime (21012212122127).

It is not an unprimeable number, because it can be changed into a prime (21012212122127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83123122 + ... + 83375522.

It is an arithmetic number, because the mean of its divisors is an integer number (729976872240).

Almost surely, 2^{21012212122122} is an apocalyptic number.

21012212122122 is an abundant number, since it is smaller than the sum of its proper divisors (25706307701238).

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

21012212122122 is a wasteful number, since it uses less digits than its factorization.

21012212122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286879.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21012212122122 its reverse (22122121221012), we get a palindrome (43134333343134).

The spelling of 21012212122122 in words is "twenty-one trillion, twelve billion, two hundred twelve million, one hundred twenty-two thousand, one hundred twenty-two".