20221221111021 has 32 divisors (see below), whose sum is σ = 34965434695680. Its totient is φ = 11309132774448.

The previous prime is 20221221111001. The next prime is 20221221111031. The reversal of 20221221111021 is 12011112212202.

It is not a de Polignac number, because 20221221111021 - 2²² = 20221216916717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20221221110985 and 20221221111003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221221111001) 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, 1138188861 + ... + 1138206626.

It is an arithmetic number, because the mean of its divisors is an integer number (1092669834240).

Almost surely, 2^{20221221111021} is an apocalyptic number.

20221221111021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20221221111021 is a deficient number, since it is larger than the sum of its proper divisors (14744213584659).

20221221111021 is a wasteful number, since it uses less digits than its factorization.

20221221111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276395550 (or 2276395544 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20221221111021 its reverse (12011112212202), we get a palindrome (32232333323223).

The spelling of 20221221111021 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, twenty-one".