21122002031 has 8 divisors (see below), whose sum is σ = 22780579920. Its totient is φ = 19468253952.

The previous prime is 21122001991. The next prime is 21122002049. The reversal of 21122002031 is 13020022112.

It is a happy number.

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 21122002031 - 2¹⁰ = 21122001007 is a prime.

It is a super-2 number, since 2×21122002031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122001997 and 21122002015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122002931) 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, 1198361 + ... + 1215858.

It is an arithmetic number, because the mean of its divisors is an integer number (2847572490).

Almost surely, 2^21122002031 is an apocalyptic number.

21122002031 is a deficient number, since it is larger than the sum of its proper divisors (1658577889).

21122002031 is a wasteful number, since it uses less digits than its factorization.

21122002031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414905.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21122002031 its reverse (13020022112), we get a palindrome (34142024143).

The spelling of 21122002031 in words is "twenty-one billion, one hundred twenty-two million, two thousand, thirty-one".