2251322920 has 512 divisors, whose sum is σ = 7365427200. Its totient is φ = 597196800.

The previous prime is 2251322891. The next prime is 2251322933. The reversal of 2251322920 is 292231522.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 30840004 + ... + 30840076.

It is an arithmetic number, because the mean of its divisors is an integer number (14385600).

Almost surely, 2^2251322920 is an apocalyptic number.

2251322920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2251322920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3682713600).

2251322920 is an abundant number, since it is smaller than the sum of its proper divisors (5114104280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2251322920 is a wasteful number, since it uses less digits than its factorization.

2251322920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 2251322920 is about 47448.1076545735. The cubic root of 2251322920 is about 1310.6274639141.

The spelling of 2251322920 in words is "two billion, two hundred fifty-one million, three hundred twenty-two thousand, nine hundred twenty".