21212131001 has 16 divisors (see below), whose sum is σ = 21816916800. Its totient is φ = 20618074368.

The previous prime is 21212130983. The next prime is 21212131019. The reversal of 21212131001 is 10013121212.

It is an interprime number because it is at equal distance from previous prime (21212130983) and next prime (21212131019).

It is a cyclic number.

It is not a de Polignac number, because 21212131001 - 2³⁴ = 4032261817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212191001) 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, 1382510 + ... + 1397768.

It is an arithmetic number, because the mean of its divisors is an integer number (1363557300).

Almost surely, 2^21212131001 is an apocalyptic number.

It is an amenable number.

21212131001 is a deficient number, since it is larger than the sum of its proper divisors (604785799).

21212131001 is a wasteful number, since it uses less digits than its factorization.

21212131001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15608.

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

Adding to 21212131001 its reverse (10013121212), we get a palindrome (31225252213).

The spelling of 21212131001 in words is "twenty-one billion, two hundred twelve million, one hundred thirty-one thousand, one".