21111021022 has 64 divisors (see below), whose sum is σ = 41883125760. Its totient is φ = 7742946816.

The previous prime is 21111021013. The next prime is 21111021023. The reversal of 21111021022 is 22012011112.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21111020993 and 21111021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111021023) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 156379 + ... + 258217.

It is an arithmetic number, because the mean of its divisors is an integer number (654423840).

Almost surely, 2^21111021022 is an apocalyptic number.

21111021022 is a deficient number, since it is larger than the sum of its proper divisors (20772104738).

21111021022 is a wasteful number, since it uses less digits than its factorization.

21111021022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101945.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21111021022 its reverse (22012011112), we get a palindrome (43123032134).

The spelling of 21111021022 in words is "twenty-one billion, one hundred eleven million, twenty-one thousand, twenty-two".