21100020022 has 16 divisors (see below), whose sum is σ = 32192925120. Its totient is φ = 10369116808.

The previous prime is 21100020001. The next prime is 21100020023. The reversal of 21100020022 is 22002000112.

It is a junction number, because it is equal to n+sod(n) for n = 21100019990 and 21100020008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100020023) 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, 691533 + ... + 721399.

It is an arithmetic number, because the mean of its divisors is an integer number (2012057820).

Almost surely, 2^21100020022 is an apocalyptic number.

21100020022 is a deficient number, since it is larger than the sum of its proper divisors (11092905098).

21100020022 is a wasteful number, since it uses less digits than its factorization.

21100020022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35915.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21100020022 its reverse (22002000112), we get a palindrome (43102020134).

The spelling of 21100020022 in words is "twenty-one billion, one hundred million, twenty thousand, twenty-two".