1210219920 has 640 divisors, whose sum is σ = 5279662080. Its totient is φ = 248002560.

The previous prime is 1210219903. The next prime is 1210219937. The reversal of 1210219920 is 299120121.

It is an interprime number because it is at equal distance from previous prime (1210219903) and next prime (1210219937).

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 9238255 + ... + 9238385.

It is an arithmetic number, because the mean of its divisors is an integer number (8249472).

Almost surely, 2^1210219920 is an apocalyptic number.

1210219920 is a gapful number since it is divisible by the number (10) 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 1210219920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2639831040).

1210219920 is an abundant number, since it is smaller than the sum of its proper divisors (4069442160).

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

1210219920 is a wasteful number, since it uses less digits than its factorization.

1210219920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1210219920 is about 34788.2152459709. The cubic root of 1210219920 is about 1065.6667913252. Note that the first 3 decimals are identical.

The spelling of 1210219920 in words is "one billion, two hundred ten million, two hundred nineteen thousand, nine hundred twenty".