31400021221 has 8 divisors (see below), whose sum is σ = 32025447680. Its totient is φ = 30779872992.

The previous prime is 31400021209. The next prime is 31400021239. The reversal of 31400021221 is 12212000413.

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 31400021221 - 2⁵ = 31400021189 is a prime.

It is a super-2 number, since 2×31400021221² (a number of 22 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 = 31400021195 and 31400021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400021321) 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, 1307541 + ... + 1331338.

It is an arithmetic number, because the mean of its divisors is an integer number (4003180960).

Almost surely, 2^31400021221 is an apocalyptic number.

It is an amenable number.

31400021221 is a deficient number, since it is larger than the sum of its proper divisors (625426459).

31400021221 is a wasteful number, since it uses less digits than its factorization.

31400021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639115.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 31400021221 its reverse (12212000413), we get a palindrome (43612021634).

The spelling of 31400021221 in words is "thirty-one billion, four hundred million, twenty-one thousand, two hundred twenty-one".