1221498630 has 200 divisors, whose sum is σ = 3647975760. Its totient is φ = 293245920.

The previous prime is 1221498613. The next prime is 1221498631. The reversal of 1221498630 is 368941221.

1221498630 is a `hidden beast` number, since 1 + 2 + 2 + 14 + 9 + 8 + 630 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221498631) by changing a digit.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 11859159 + ... + 11859261.

Almost surely, 2^1221498630 is an apocalyptic number.

1221498630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221498630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1823987880).

1221498630 is an abundant number, since it is smaller than the sum of its proper divisors (2426477130).

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

1221498630 is an equidigital number, since it uses as much as digits as its factorization.

1221498630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1221498630 is about 34949.9446351493. The cubic root of 1221498630 is about 1068.9670731743.

The spelling of 1221498630 in words is "one billion, two hundred twenty-one million, four hundred ninety-eight thousand, six hundred thirty".