31354230021 has 8 divisors (see below), whose sum is σ = 42219557664. Its totient is φ = 20695861200.

The previous prime is 31354230013. The next prime is 31354230023. The reversal of 31354230021 is 12003245313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31354230021 - 2³ = 31354230013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31354229973 and 31354230000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31354230023) 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, 51739351 + ... + 51739956.

It is an arithmetic number, because the mean of its divisors is an integer number (5277444708).

Almost surely, 2^31354230021 is an apocalyptic number.

It is an amenable number.

31354230021 is a deficient number, since it is larger than the sum of its proper divisors (10865327643).

31354230021 is a wasteful number, since it uses less digits than its factorization.

31354230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103479411.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 31354230021 its reverse (12003245313), we get a palindrome (43357475334).

The spelling of 31354230021 in words is "thirty-one billion, three hundred fifty-four million, two hundred thirty thousand, twenty-one".