2651722384921 has 9 divisors (see below), whose sum is σ = 2688665481471. Its totient is φ = 2615280175152.

The previous prime is 2651722384919. The next prime is 2651722384943. The reversal of 2651722384921 is 1294832271562.

The square root of 2651722384921 is 1628411.

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., 1505246803225 + 1146475581696 = 1226885^2 + 1070736^2 .

It is not a de Polignac number, because 2651722384921 - 2¹ = 2651722384919 is a prime.

It is a super-2 number, since 2×2651722384921² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2651722384721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 118862850 + ... + 118885156.

Almost surely, 2^{2651722384921} is an apocalyptic number.

2651722384921 is the 1628411-st square number.

2651722384921 is the 814206-th centered octagonal number.

It is an amenable number.

2651722384921 is a deficient number, since it is larger than the sum of its proper divisors (36943096550).

2651722384921 is an frugal number, since it uses more digits than its factorization.

2651722384921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44760 (or 22380 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 52.

The spelling of 2651722384921 in words is "two trillion, six hundred fifty-one billion, seven hundred twenty-two million, three hundred eighty-four thousand, nine hundred twenty-one".