21121707001 has 16 divisors (see below), whose sum is σ = 23665229568. Its totient is φ = 18747097600.

The previous prime is 21121706989. The next prime is 21121707011. The reversal of 21121707001 is 10070712112.

It is not a de Polignac number, because 21121707001 - 2¹⁹ = 21121182713 is a prime.

It is a super-2 number, since 2×21121707001² (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 (21121707011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352660 + ... + 408181.

It is an arithmetic number, because the mean of its divisors is an integer number (1479076848).

Almost surely, 2^21121707001 is an apocalyptic number.

It is an amenable number.

21121707001 is a deficient number, since it is larger than the sum of its proper divisors (2543522567).

21121707001 is a wasteful number, since it uses less digits than its factorization.

21121707001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760952.

The product of its (nonzero) digits is 196, while the sum is 22.

The spelling of 21121707001 in words is "twenty-one billion, one hundred twenty-one million, seven hundred seven thousand, one".