20010101112221 has 4 divisors (see below), whose sum is σ = 21829201213344. Its totient is φ = 18191001011100.

The previous prime is 20010101112203. The next prime is 20010101112233. The reversal of 20010101112221 is 12221110101002.

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 a de Polignac number, because none of the positive numbers 2^k-20010101112221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010101112196 and 20010101112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010101132221) 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, 909550050545 + ... + 909550050566.

It is an arithmetic number, because the mean of its divisors is an integer number (5457300303336).

Almost surely, 2^{20010101112221} is an apocalyptic number.

It is an amenable number.

20010101112221 is a deficient number, since it is larger than the sum of its proper divisors (1819100101123).

20010101112221 is a wasteful number, since it uses less digits than its factorization.

20010101112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819100101122.

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

Adding to 20010101112221 its reverse (12221110101002), we get a palindrome (32231211213223).

The spelling of 20010101112221 in words is "twenty trillion, ten billion, one hundred one million, one hundred twelve thousand, two hundred twenty-one".