21001211010022 has 4 divisors (see below), whose sum is σ = 31501816515036. Its totient is φ = 10500605505010.

The previous prime is 21001211009963. The next prime is 21001211010037. The reversal of 21001211010022 is 22001011210012.

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 = 21001211009984 and 21001211010011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250302752504 + ... + 5250302752507.

It is an arithmetic number, because the mean of its divisors is an integer number (7875454128759).

Almost surely, 2^{21001211010022} is an apocalyptic number.

21001211010022 is a deficient number, since it is larger than the sum of its proper divisors (10500605505014).

21001211010022 is a wasteful number, since it uses less digits than its factorization.

21001211010022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500605505013.

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

Adding to 21001211010022 its reverse (22001011210012), we get a palindrome (43002222220034).

The spelling of 21001211010022 in words is "twenty-one trillion, one billion, two hundred eleven million, ten thousand, twenty-two".