21011021022 has 8 divisors (see below), whose sum is σ = 42022042056. Its totient is φ = 7003673672.

The previous prime is 21011020981. The next prime is 21011021033. The reversal of 21011021022 is 22012011012.

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

21011021022 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21011020989 and 21011021007.

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, 1750918413 + ... + 1750918424.

It is an arithmetic number, because the mean of its divisors is an integer number (5252755257).

Almost surely, 2^21011021022 is an apocalyptic number.

21011021022 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011021022 is a wasteful number, since it uses less digits than its factorization.

21011021022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501836842.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21011021022 its reverse (22012011012), we get a palindrome (43023032034).

It can be divided in two parts, 210110 and 21022, that added together give a palindrome (231132).

The spelling of 21011021022 in words is "twenty-one billion, eleven million, twenty-one thousand, twenty-two".