21021201022 has 4 divisors (see below), whose sum is σ = 31531801536. Its totient is φ = 10510600510.

The previous prime is 21021201001. The next prime is 21021201043. The reversal of 21021201022 is 22010212012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21021201001) and next prime (21021201043).

It is a junction number, because it is equal to n+sod(n) for n = 21021200993 and 21021201011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255300254 + ... + 5255300257.

It is an arithmetic number, because the mean of its divisors is an integer number (7882950384).

Almost surely, 2^21021201022 is an apocalyptic number.

21021201022 is a deficient number, since it is larger than the sum of its proper divisors (10510600514).

21021201022 is a wasteful number, since it uses less digits than its factorization.

21021201022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510600513.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21021201022 its reverse (22010212012), we get a palindrome (43031413034).

The spelling of 21021201022 in words is "twenty-one billion, twenty-one million, two hundred one thousand, twenty-two".