1251320000220 has 72 divisors (see below), whose sum is σ = 3995442818640. Its totient is φ = 316122946560.

The previous prime is 1251320000219. The next prime is 1251320000267. The reversal of 1251320000220 is 220000231521.

1251320000220 is a `hidden beast` number, since 125 + 1 + 320 + 0 + 0 + 0 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1251320000193 and 1251320000202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182938101 + ... + 182944940.

It is an arithmetic number, because the mean of its divisors is an integer number (55492261370).

Almost surely, 2^{1251320000220} is an apocalyptic number.

1251320000220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251320000220 is an abundant number, since it is smaller than the sum of its proper divisors (2744122818420).

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

1251320000220 is a wasteful number, since it uses less digits than its factorization.

1251320000220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365883075 (or 365883070 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 1251320000220 its reverse (220000231521), we get a palindrome (1471320231741).

The spelling of 1251320000220 in words is "one trillion, two hundred fifty-one billion, three hundred twenty million, two hundred twenty", and thus it is an aban number.