21122010001 has 4 divisors (see below), whose sum is σ = 21122305600. Its totient is φ = 21121714404.

The previous prime is 21122009983. The next prime is 21122010047. The reversal of 21122010001 is 10001022112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21122010001 - 2⁵ = 21122009969 is a prime.

It is a super-2 number, since 2×21122010001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21122010001.

It is not an unprimeable number, because it can be changed into a prime (21122010071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33580 + ... + 208258.

It is an arithmetic number, because the mean of its divisors is an integer number (5280576400).

Almost surely, 2^21122010001 is an apocalyptic number.

It is an amenable number.

21122010001 is a deficient number, since it is larger than the sum of its proper divisors (295599).

21122010001 is a wasteful number, since it uses less digits than its factorization.

21122010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295598.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21122010001 its reverse (10001022112), we get a palindrome (31123032113).

The spelling of 21122010001 in words is "twenty-one billion, one hundred twenty-two million, ten thousand, one".