21011122100070 has 32 divisors (see below), whose sum is σ = 56029658934240. Its totient is φ = 5602965893280.

The previous prime is 21011122100069. The next prime is 21011122100071. The reversal of 21011122100070 is 7000122111012.

It is an interprime number because it is at equal distance from previous prime (21011122100069) and next prime (21011122100071).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011122100071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38909485101 + ... + 38909485640.

It is an arithmetic number, because the mean of its divisors is an integer number (1750926841695).

Almost surely, 2^{21011122100070} is an apocalyptic number.

21011122100070 is an abundant number, since it is smaller than the sum of its proper divisors (35018536834170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011122100070 is a wasteful number, since it uses less digits than its factorization.

21011122100070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77818970757 (or 77818970751 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

Adding to 21011122100070 its reverse (7000122111012), we get a palindrome (28011244211082).

The spelling of 21011122100070 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, one hundred thousand, seventy".