21210212122122 has 16 divisors (see below), whose sum is σ = 42421100192352. Its totient is φ = 7069958049360.

The previous prime is 21210212122109. The next prime is 21210212122159. The reversal of 21210212122122 is 22122121201212.

It is a super-2 number, since 2×21210212122122² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27756129 + ... + 28510052.

It is an arithmetic number, because the mean of its divisors is an integer number (2651318762022).

Almost surely, 2^{21210212122122} is an apocalyptic number.

21210212122122 is an abundant number, since it is smaller than the sum of its proper divisors (21210888070230).

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

21210212122122 is a wasteful number, since it uses less digits than its factorization.

21210212122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56329013.

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

Adding to 21210212122122 its reverse (22122121201212), we get a palindrome (43332333323334).

The spelling of 21210212122122 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, one hundred twenty-two thousand, one hundred twenty-two".