21012223001 has 8 divisors (see below), whose sum is σ = 26197057344. Its totient is φ = 16373160720.

The previous prime is 21012222991. The next prime is 21012223021. The reversal of 21012223001 is 10032221012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21012223001 - 2²⁶ = 20945114137 is a prime.

It is a super-3 number, since 3×21012223001³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012223021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136442930 + ... + 136443083.

It is an arithmetic number, because the mean of its divisors is an integer number (3274632168).

Almost surely, 2^21012223001 is an apocalyptic number.

It is an amenable number.

21012223001 is a deficient number, since it is larger than the sum of its proper divisors (5184834343).

21012223001 is a wasteful number, since it uses less digits than its factorization.

21012223001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272886031.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21012223001 its reverse (10032221012), we get a palindrome (31044444013).

The spelling of 21012223001 in words is "twenty-one billion, twelve million, two hundred twenty-three thousand, one".