21012223101 has 48 divisors (see below), whose sum is σ = 30199329600. Its totient is φ = 12957428736.

The previous prime is 21012223087. The next prime is 21012223103. The reversal of 21012223101 is 10132221012.

It is not a de Polignac number, because 21012223101 - 2⁵ = 21012223069 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012223103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121457851 + ... + 121458023.

It is an arithmetic number, because the mean of its divisors is an integer number (629152700).

Almost surely, 2^21012223101 is an apocalyptic number.

It is an amenable number.

21012223101 is a deficient number, since it is larger than the sum of its proper divisors (9187106499).

21012223101 is a wasteful number, since it uses less digits than its factorization.

21012223101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21012223101 its reverse (10132221012), we get a palindrome (31144444113).

The spelling of 21012223101 in words is "twenty-one billion, twelve million, two hundred twenty-three thousand, one hundred one".