1051172106721 has 32 divisors (see below), whose sum is σ = 1186408903680. Its totient is φ = 923062392000.

The previous prime is 1051172106703. The next prime is 1051172106727. The reversal of 1051172106721 is 1276012711501.

It is a cyclic number.

It is not a de Polignac number, because 1051172106721 - 2⁹ = 1051172106209 is a prime.

It is a super-2 number, since 2×1051172106721² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1051172106727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42171100 + ... + 42196018.

It is an arithmetic number, because the mean of its divisors is an integer number (37075278240).

Almost surely, 2^{1051172106721} is an apocalyptic number.

1051172106721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1051172106721 is a deficient number, since it is larger than the sum of its proper divisors (135236796959).

1051172106721 is a wasteful number, since it uses less digits than its factorization.

1051172106721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25957.

The product of its (nonzero) digits is 5880, while the sum is 34.

The spelling of 1051172106721 in words is "one trillion, fifty-one billion, one hundred seventy-two million, one hundred six thousand, seven hundred twenty-one".