2122121100021 has 8 divisors (see below), whose sum is σ = 3047148246240. Its totient is φ = 1305920676912.

The previous prime is 2122121100013. The next prime is 2122121100079. The reversal of 2122121100021 is 1200011212212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2122121100021 - 2³ = 2122121100013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122121102021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27206680731 + ... + 27206680808.

It is an arithmetic number, because the mean of its divisors is an integer number (380893530780).

Almost surely, 2^{2122121100021} is an apocalyptic number.

It is an amenable number.

2122121100021 is a deficient number, since it is larger than the sum of its proper divisors (925027146219).

2122121100021 is a wasteful number, since it uses less digits than its factorization.

2122121100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54413361555.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2122121100021 its reverse (1200011212212), we get a palindrome (3322132312233).

The spelling of 2122121100021 in words is "two trillion, one hundred twenty-two billion, one hundred twenty-one million, one hundred thousand, twenty-one".