21012102331 has 4 divisors (see below), whose sum is σ = 22922293464. Its totient is φ = 19101911200.

The previous prime is 21012102301. The next prime is 21012102361. The reversal of 21012102331 is 13320121012.

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

It is an interprime number because it is at equal distance from previous prime (21012102301) and next prime (21012102361).

It is a cyclic number.

It is not a de Polignac number, because 21012102331 - 2⁹ = 21012101819 is a prime.

It is a super-2 number, since 2×21012102331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012102301) 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, 955095550 + ... + 955095571.

It is an arithmetic number, because the mean of its divisors is an integer number (5730573366).

Almost surely, 2^21012102331 is an apocalyptic number.

21012102331 is a deficient number, since it is larger than the sum of its proper divisors (1910191133).

21012102331 is a wasteful number, since it uses less digits than its factorization.

21012102331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910191132.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21012102331 its reverse (13320121012), we get a palindrome (34332223343).

The spelling of 21012102331 in words is "twenty-one billion, twelve million, one hundred two thousand, three hundred thirty-one".