20212121121123 has 64 divisors (see below), whose sum is σ = 28581560156160. Its totient is φ = 12687648019200.

The previous prime is 20212121121091. The next prime is 20212121121149. The reversal of 20212121121123 is 32112112121202.

It is not a de Polignac number, because 20212121121123 - 2⁵ = 20212121121091 is a prime.

It is a super-2 number, since 2×20212121121123² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20212121121123.

It is not an unprimeable number, because it can be changed into a prime (20212121121193) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 536239708 + ... + 536277398.

It is an arithmetic number, because the mean of its divisors is an integer number (446586877440).

Almost surely, 2^{20212121121123} is an apocalyptic number.

20212121121123 is a deficient number, since it is larger than the sum of its proper divisors (8369439035037).

20212121121123 is a wasteful number, since it uses less digits than its factorization.

20212121121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38848.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 20212121121123 its reverse (32112112121202), we get a palindrome (52324233242325).

The spelling of 20212121121123 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-three".