21210101231 has 8 divisors (see below), whose sum is σ = 23161512144. Its totient is φ = 19262560320.

The previous prime is 21210101201. The next prime is 21210101249. The reversal of 21210101231 is 13210101212.

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

It is a cyclic number.

It is not a de Polignac number, because 21210101231 - 2¹⁰ = 21210100207 is a prime.

It is a super-2 number, since 2×21210101231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210101201) 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, 956030 + ... + 977963.

It is an arithmetic number, because the mean of its divisors is an integer number (2895189018).

Almost surely, 2^21210101231 is an apocalyptic number.

21210101231 is a deficient number, since it is larger than the sum of its proper divisors (1951410913).

21210101231 is a wasteful number, since it uses less digits than its factorization.

21210101231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935001.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21210101231 its reverse (13210101212), we get a palindrome (34420202443).

The spelling of 21210101231 in words is "twenty-one billion, two hundred ten million, one hundred one thousand, two hundred thirty-one".