220121111002001 has 4 divisors (see below), whose sum is σ = 240132121093104. Its totient is φ = 200110100910900.

The previous prime is 220121111001997. The next prime is 220121111002031. The reversal of 220121111002001 is 100200111121022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220121111002001 - 2² = 220121111001997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220121111002031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10005505045535 + ... + 10005505045556.

It is an arithmetic number, because the mean of its divisors is an integer number (60033030273276).

Almost surely, 2^{220121111002001} is an apocalyptic number.

It is an amenable number.

220121111002001 is a deficient number, since it is larger than the sum of its proper divisors (20011010091103).

220121111002001 is a wasteful number, since it uses less digits than its factorization.

220121111002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20011010091102.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 220121111002001 its reverse (100200111121022), we get a palindrome (320321222123023).

The spelling of 220121111002001 in words is "two hundred twenty trillion, one hundred twenty-one billion, one hundred eleven million, two thousand, one".