1251440402210 has 32 divisors (see below), whose sum is σ = 2353430201472. Its totient is φ = 478221511680.

The previous prime is 1251440402089. The next prime is 1251440402221. The reversal of 1251440402210 is 122040441521.

It is a super-2 number, since 2×1251440402210² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1251440402210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3167999 + ... + 3541058.

It is an arithmetic number, because the mean of its divisors is an integer number (73544693796).

Almost surely, 2^{1251440402210} is an apocalyptic number.

1251440402210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251440402210 is a deficient number, since it is larger than the sum of its proper divisors (1101989799262).

1251440402210 is a wasteful number, since it uses less digits than its factorization.

1251440402210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6709898.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 1251440402210 its reverse (122040441521), we get a palindrome (1373480843731).

The spelling of 1251440402210 in words is "one trillion, two hundred fifty-one billion, four hundred forty million, four hundred two thousand, two hundred ten".