21011000012122 has 32 divisors (see below), whose sum is σ = 31605631574400. Its totient is φ = 10475839395840.

The previous prime is 21011000012117. The next prime is 21011000012131. The reversal of 21011000012122 is 22121000011012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7693517497 + ... + 7693520227.

It is an arithmetic number, because the mean of its divisors is an integer number (987675986700).

Almost surely, 2^{21011000012122} is an apocalyptic number.

21011000012122 is a deficient number, since it is larger than the sum of its proper divisors (10594631562278).

21011000012122 is a wasteful number, since it uses less digits than its factorization.

21011000012122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8406.

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

Adding to 21011000012122 its reverse (22121000011012), we get a palindrome (43132000023134).

The spelling of 21011000012122 in words is "twenty-one trillion, eleven billion, twelve thousand, one hundred twenty-two".