2661245421 has 8 divisors (see below), whose sum is σ = 3623823744. Its totient is φ = 1736415360.

The previous prime is 2661245369. The next prime is 2661245423. The reversal of 2661245421 is 1245421662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2661245421 - 2¹⁴ = 2661229037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661245423) 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, 9436900 + ... + 9437181.

It is an arithmetic number, because the mean of its divisors is an integer number (452977968).

Almost surely, 2^2661245421 is an apocalyptic number.

It is an amenable number.

2661245421 is a deficient number, since it is larger than the sum of its proper divisors (962578323).

2661245421 is a wasteful number, since it uses less digits than its factorization.

2661245421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18874131.

The product of its digits is 23040, while the sum is 33.

The square root of 2661245421 is about 51587.2602587112. The cubic root of 2661245421 is about 1385.7821907231.

The spelling of 2661245421 in words is "two billion, six hundred sixty-one million, two hundred forty-five thousand, four hundred twenty-one".