2134699245721 has 27 divisors (see below), whose sum is σ = 2566290641823. Its totient is φ = 1770455277360.

The previous prime is 2134699245691. The next prime is 2134699245737. The reversal of 2134699245721 is 1275429964312.

The square root of 2134699245721 is 1461061.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2123300694025 + 11398551696 = 1457155^2 + 106764^2 .

It is not a de Polignac number, because 2134699245721 - 2¹¹ = 2134699243673 is a prime.

It is a super-3 number, since 3×2134699245721³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2134699245761) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 317046871 + ... + 317053603.

It is an arithmetic number, because the mean of its divisors is an integer number (95047801549).

Almost surely, 2^{2134699245721} is an apocalyptic number.

2134699245721 is the 1461061-st square number.

2134699245721 is the 730531-st centered octagonal number.

It is an amenable number.

2134699245721 is a deficient number, since it is larger than the sum of its proper divisors (431591396102).

2134699245721 is an frugal number, since it uses more digits than its factorization.

2134699245721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13542 (or 6771 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 55.

The spelling of 2134699245721 in words is "two trillion, one hundred thirty-four billion, six hundred ninety-nine million, two hundred forty-five thousand, seven hundred twenty-one".