2561021270 has 16 divisors (see below), whose sum is σ = 4881005568. Its totient is φ = 964149120.

The previous prime is 2561021261. The next prime is 2561021279. The reversal of 2561021270 is 721201652.

It is an interprime number because it is at equal distance from previous prime (2561021261) and next prime (2561021279).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561021279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7532246 + ... + 7532585.

It is an arithmetic number, because the mean of its divisors is an integer number (305062848).

Almost surely, 2^2561021270 is an apocalyptic number.

2561021270 is a deficient number, since it is larger than the sum of its proper divisors (2319984298).

2561021270 is a wasteful number, since it uses less digits than its factorization.

2561021270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15064855.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 2561021270 is about 50606.5338666856. The cubic root of 2561021270 is about 1368.1626443165.

The spelling of 2561021270 in words is "two billion, five hundred sixty-one million, twenty-one thousand, two hundred seventy".