21221001022 has 32 divisors (see below), whose sum is σ = 34476702624. Its totient is φ = 9738249600.

The previous prime is 21221001019. The next prime is 21221001023. The reversal of 21221001022 is 22010012212.

It is a happy number.

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 = 21221000993 and 21221001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221001023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5551872 + ... + 5555692.

It is an arithmetic number, because the mean of its divisors is an integer number (1077396957).

Almost surely, 2^21221001022 is an apocalyptic number.

21221001022 is a deficient number, since it is larger than the sum of its proper divisors (13255701602).

21221001022 is a wasteful number, since it uses less digits than its factorization.

21221001022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5004.

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

Adding to 21221001022 its reverse (22010012212), we get a palindrome (43231013234).

The spelling of 21221001022 in words is "twenty-one billion, two hundred twenty-one million, one thousand, twenty-two".