21002020022 has 8 divisors (see below), whose sum is σ = 31506106896. Its totient is φ = 10499984392.

The previous prime is 21002019959. The next prime is 21002020043. The reversal of 21002020022 is 22002020012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21002019985 and 21002020012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486953 + ... + 528324.

It is an arithmetic number, because the mean of its divisors is an integer number (3938263362).

Almost surely, 2^21002020022 is an apocalyptic number.

21002020022 is a deficient number, since it is larger than the sum of its proper divisors (10504086874).

21002020022 is a wasteful number, since it uses less digits than its factorization.

21002020022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025622.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 21002020022 its reverse (22002020012), we get a palindrome (43004040034).

The spelling of 21002020022 in words is "twenty-one billion, two million, twenty thousand, twenty-two".