21001022001022 has 16 divisors (see below), whose sum is σ = 36200656713312. Its totient is φ = 8950711822560.

The previous prime is 21001022000977. The next prime is 21001022001077. The reversal of 21001022001022 is 22010022010012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21001022000993 and 21001022001011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4143845533 + ... + 4143850600.

It is an arithmetic number, because the mean of its divisors is an integer number (2262541044582).

Almost surely, 2^{21001022001022} is an apocalyptic number.

21001022001022 is a deficient number, since it is larger than the sum of its proper divisors (15199634712290).

21001022001022 is a wasteful number, since it uses less digits than its factorization.

21001022001022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8287696323.

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

Adding to 21001022001022 its reverse (22010022010012), we get a palindrome (43011044011034).

The spelling of 21001022001022 in words is "twenty-one trillion, one billion, twenty-two million, one thousand, twenty-two".