21126906801 has 96 divisors (see below), whose sum is σ = 41337983232. Its totient is φ = 10040647680.

The previous prime is 21126906781. The next prime is 21126906817. The reversal of 21126906801 is 10860962112.

It is not a de Polignac number, because 21126906801 - 2¹⁰ = 21126905777 is a prime.

It is a super-3 number, since 3×21126906801³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21126906821) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1007641 + ... + 1028393.

It is an arithmetic number, because the mean of its divisors is an integer number (430603992).

Almost surely, 2^21126906801 is an apocalyptic number.

21126906801 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21126906801 is a deficient number, since it is larger than the sum of its proper divisors (20211076431).

21126906801 is a wasteful number, since it uses less digits than its factorization.

21126906801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20903 (or 20900 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 21126906801 in words is "twenty-one billion, one hundred twenty-six million, nine hundred six thousand, eight hundred one".