31421415021 has 8 divisors (see below), whose sum is σ = 43027523424. Its totient is φ = 20381458320.

The previous prime is 31421414929. The next prime is 31421415029. The reversal of 31421415021 is 12051412413.

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

It is not a de Polignac number, because 31421415021 - 2¹¹ = 31421412973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31421414982 and 31421415000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421415029) 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, 141537795 + ... + 141538016.

It is an arithmetic number, because the mean of its divisors is an integer number (5378440428).

Almost surely, 2^31421415021 is an apocalyptic number.

It is an amenable number.

31421415021 is a deficient number, since it is larger than the sum of its proper divisors (11606108403).

31421415021 is a wasteful number, since it uses less digits than its factorization.

31421415021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283075851.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 31421415021 its reverse (12051412413), we get a palindrome (43472827434).

The spelling of 31421415021 in words is "thirty-one billion, four hundred twenty-one million, four hundred fifteen thousand, twenty-one".