2121020221123 has 32 divisors (see below), whose sum is σ = 2327402004480. Its totient is φ = 1925410500000.

The previous prime is 2121020221087. The next prime is 2121020221127. The reversal of 2121020221123 is 3211220201212.

It is a cyclic number.

It is not a de Polignac number, because 2121020221123 - 2³⁷ = 1983581267651 is a prime.

It is a super-2 number, since 2×2121020221123² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121020221123.

It is not an unprimeable number, because it can be changed into a prime (2121020221127) 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, 141857298 + ... + 141872248.

It is an arithmetic number, because the mean of its divisors is an integer number (72731312640).

Almost surely, 2^{2121020221123} is an apocalyptic number.

2121020221123 is a deficient number, since it is larger than the sum of its proper divisors (206381783357).

2121020221123 is a wasteful number, since it uses less digits than its factorization.

2121020221123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17359.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2121020221123 its reverse (3211220201212), we get a palindrome (5332240422335).

The spelling of 2121020221123 in words is "two trillion, one hundred twenty-one billion, twenty million, two hundred twenty-one thousand, one hundred twenty-three".