1902400221 has 32 divisors (see below), whose sum is σ = 2612638080. Its totient is φ = 1230971904.

The previous prime is 1902400139. The next prime is 1902400237. The reversal of 1902400221 is 1220042091.

It is not a de Polignac number, because 1902400221 - 2¹⁰ = 1902399197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1902400271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4890295 + ... + 4890683.

It is an arithmetic number, because the mean of its divisors is an integer number (81644940).

Almost surely, 2^1902400221 is an apocalyptic number.

It is an amenable number.

1902400221 is a deficient number, since it is larger than the sum of its proper divisors (710237859).

1902400221 is a wasteful number, since it uses less digits than its factorization.

1902400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1902400221 is about 43616.5131687530. The cubic root of 1902400221 is about 1239.0836581145.

The spelling of 1902400221 in words is "one billion, nine hundred two million, four hundred thousand, two hundred twenty-one".