31221210121330 has 8 divisors (see below), whose sum is σ = 56198178218412. Its totient is φ = 12488484048528.

The previous prime is 31221210121273. The next prime is 31221210121363. The reversal of 31221210121330 is 3312101212213.

It can be written as a sum of positive squares in 2 ways, for example, as 31182854073921 + 38356047409 = 5584161^2 + 195847^2 .

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

It is a super-2 number, since 2×31221210121330² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561060506057 + ... + 1561060506076.

Almost surely, 2^{31221210121330} is an apocalyptic number.

31221210121330 is a deficient number, since it is larger than the sum of its proper divisors (24976968097082).

31221210121330 is a wasteful number, since it uses less digits than its factorization.

31221210121330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122121012140.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31221210121330 its reverse (3312101212213), we get a palindrome (34533311333543).

The spelling of 31221210121330 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty-one thousand, three hundred thirty".