21121310001 has 12 divisors (see below), whose sum is σ = 30954647696. Its totient is φ = 12800793720.

The previous prime is 21121309987. The next prime is 21121310003. The reversal of 21121310001 is 10001312112.

It is not a de Polignac number, because 21121310001 - 2⁷ = 21121309873 is a prime.

It is a super-2 number, since 2×21121310001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121310003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29092351 + ... + 29093076.

Almost surely, 2^21121310001 is an apocalyptic number.

It is an amenable number.

21121310001 is a deficient number, since it is larger than the sum of its proper divisors (9833337695).

21121310001 is a wasteful number, since it uses less digits than its factorization.

21121310001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58185452 (or 58185441 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21121310001 its reverse (10001312112), we get a palindrome (31122622113).

The spelling of 21121310001 in words is "twenty-one billion, one hundred twenty-one million, three hundred ten thousand, one".