2620145256121 has 4 divisors (see below), whose sum is σ = 2620157750500. Its totient is φ = 2620132761744.

The previous prime is 2620145256107. The next prime is 2620145256167. The reversal of 2620145256121 is 1216525410262.

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

It can be written as a sum of positive squares in 2 ways, for example, as 529984000000 + 2090161256121 = 728000^2 + 1445739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2620145256121 is a prime.

It is a super-2 number, since 2×2620145256121² (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 (2620145256221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5927166 + ... + 6353863.

It is an arithmetic number, because the mean of its divisors is an integer number (655039437625).

Almost surely, 2^{2620145256121} is an apocalyptic number.

It is an amenable number.

2620145256121 is a deficient number, since it is larger than the sum of its proper divisors (12494379).

2620145256121 is a wasteful number, since it uses less digits than its factorization.

2620145256121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12494378.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 2620145256121 in words is "two trillion, six hundred twenty billion, one hundred forty-five million, two hundred fifty-six thousand, one hundred twenty-one".