21011001129 has 16 divisors (see below), whose sum is σ = 31135976640. Its totient is φ = 14003478720.

The previous prime is 21011001127. The next prime is 21011001197. The reversal of 21011001129 is 92110011012.

It is a happy number.

It is not a de Polignac number, because 21011001129 - 2¹ = 21011001127 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011001127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5427 + ... + 205064.

It is an arithmetic number, because the mean of its divisors is an integer number (1945998540).

Almost surely, 2^21011001129 is an apocalyptic number.

It is an amenable number.

21011001129 is a deficient number, since it is larger than the sum of its proper divisors (10124975511).

21011001129 is a wasteful number, since it uses less digits than its factorization.

21011001129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214197 (or 214191 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 21011001129 in words is "twenty-one billion, eleven million, one thousand, one hundred twenty-nine".