21312132201 has 24 divisors (see below), whose sum is σ = 31634226624. Its totient is φ = 13816202400.

The previous prime is 21312132199. The next prime is 21312132203. The reversal of 21312132201 is 10223121312.

21312132201 is a `hidden beast` number, since 21 + 312 + 132 + 201 = 666.

It is an interprime number because it is at equal distance from previous prime (21312132199) and next prime (21312132203).

It is not a de Polignac number, because 21312132201 - 2¹ = 21312132199 is a prime.

It is a super-2 number, since 2×21312132201² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21312132203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 597726 + ... + 632376.

It is an arithmetic number, because the mean of its divisors is an integer number (1318092776).

Almost surely, 2^21312132201 is an apocalyptic number.

It is an amenable number.

21312132201 is a deficient number, since it is larger than the sum of its proper divisors (10322094423).

21312132201 is a wasteful number, since it uses less digits than its factorization.

21312132201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36541 (or 36538 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21312132201 its reverse (10223121312), we get a palindrome (31535253513).

The spelling of 21312132201 in words is "twenty-one billion, three hundred twelve million, one hundred thirty-two thousand, two hundred one".