31030121002 has 4 divisors (see below), whose sum is σ = 46545181506. Its totient is φ = 15515060500.

The previous prime is 31030120999. The next prime is 31030121009. The reversal of 31030121002 is 20012103013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 29377617201 + 1652503801 = 171399^2 + 40651^2 .

It is a super-2 number, since 2×31030121002² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31030121009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7757530249 + ... + 7757530252.

Almost surely, 2^31030121002 is an apocalyptic number.

31030121002 is a deficient number, since it is larger than the sum of its proper divisors (15515060504).

31030121002 is a wasteful number, since it uses less digits than its factorization.

31030121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15515060503.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31030121002 its reverse (20012103013), we get a palindrome (51042224015).

The spelling of 31030121002 in words is "thirty-one billion, thirty million, one hundred twenty-one thousand, two".