21203212101 has 32 divisors (see below), whose sum is σ = 30015674112. Its totient is φ = 13285071360.

The previous prime is 21203212099. The next prime is 21203212103. The reversal of 21203212101 is 10121230212.

It is an interprime number because it is at equal distance from previous prime (21203212099) and next prime (21203212103).

It is not a de Polignac number, because 21203212101 - 2¹ = 21203212099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203212103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5103441 + ... + 5107593.

It is an arithmetic number, because the mean of its divisors is an integer number (937989816).

Almost surely, 2^21203212101 is an apocalyptic number.

It is an amenable number.

21203212101 is a deficient number, since it is larger than the sum of its proper divisors (8812462011).

21203212101 is a wasteful number, since it uses less digits than its factorization.

21203212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5453.

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

Adding to 21203212101 its reverse (10121230212), we get a palindrome (31324442313).

The spelling of 21203212101 in words is "twenty-one billion, two hundred three million, two hundred twelve thousand, one hundred one".