21211312101 has 16 divisors (see below), whose sum is σ = 32335822848. Its totient is φ = 12115566000.

The previous prime is 21211312099. The next prime is 21211312181. The reversal of 21211312101 is 10121311212.

It is not a de Polignac number, because 21211312101 - 2¹ = 21211312099 is a prime.

It is a super-2 number, since 2×21211312101² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211312181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165445 + ... + 264186.

It is an arithmetic number, because the mean of its divisors is an integer number (2020988928).

Almost surely, 2^21211312101 is an apocalyptic number.

21211312101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21211312101 is a deficient number, since it is larger than the sum of its proper divisors (11124510747).

21211312101 is a wasteful number, since it uses less digits than its factorization.

21211312101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431992.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21211312101 its reverse (10121311212), we get a palindrome (31332623313).

The spelling of 21211312101 in words is "twenty-one billion, two hundred eleven million, three hundred twelve thousand, one hundred one".