21001030323131 has 4 divisors (see below), whose sum is σ = 21110983361664. Its totient is φ = 20891077284600.

The previous prime is 21001030323083. The next prime is 21001030323167. The reversal of 21001030323131 is 13132303010012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21001030323131 - 2²² = 21001026128827 is a prime.

It is a super-2 number, since 2×21001030323131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001030323631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54976518980 + ... + 54976519361.

It is an arithmetic number, because the mean of its divisors is an integer number (5277745840416).

Almost surely, 2^{21001030323131} is an apocalyptic number.

21001030323131 is a deficient number, since it is larger than the sum of its proper divisors (109953038533).

21001030323131 is a wasteful number, since it uses less digits than its factorization.

21001030323131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109953038532.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21001030323131 its reverse (13132303010012), we get a palindrome (34133333333143).

The spelling of 21001030323131 in words is "twenty-one trillion, one billion, thirty million, three hundred twenty-three thousand, one hundred thirty-one".