21001202001022 has 4 divisors (see below), whose sum is σ = 31501803001536. Its totient is φ = 10500601000510.

The previous prime is 21001202001007. The next prime is 21001202001029. The reversal of 21001202001022 is 22010020210012.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21001202000993 and 21001202001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001202001029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250300500254 + ... + 5250300500257.

It is an arithmetic number, because the mean of its divisors is an integer number (7875450750384).

Almost surely, 2^{21001202001022} is an apocalyptic number.

21001202001022 is a deficient number, since it is larger than the sum of its proper divisors (10500601000514).

21001202001022 is a wasteful number, since it uses less digits than its factorization.

21001202001022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500601000513.

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

Adding to 21001202001022 its reverse (22010020210012), we get a palindrome (43011222211034).

The spelling of 21001202001022 in words is "twenty-one trillion, one billion, two hundred two million, one thousand, twenty-two".