2555007021 has 24 divisors (see below), whose sum is σ = 4286939904. Its totient is φ = 1436067360.

The previous prime is 2555006989. The next prime is 2555007029. The reversal of 2555007021 is 1207005552.

It is a happy number.

2555007021 is a `hidden beast` number, since 25 + 550 + 0 + 70 + 21 = 666.

It is not a de Polignac number, because 2555007021 - 2⁵ = 2555006989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2555007029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 328581 + ... + 336266.

It is an arithmetic number, because the mean of its divisors is an integer number (178622496).

Almost surely, 2^2555007021 is an apocalyptic number.

2555007021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2555007021 is a deficient number, since it is larger than the sum of its proper divisors (1731932883).

2555007021 is a wasteful number, since it uses less digits than its factorization.

2555007021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664921 (or 664918 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 2555007021 is about 50547.0772745566. The cubic root of 2555007021 is about 1367.0908166413.

The spelling of 2555007021 in words is "two billion, five hundred fifty-five million, seven thousand, twenty-one".