1220101998 has 32 divisors (see below), whose sum is σ = 2491809696. Its totient is φ = 398181888.

The previous prime is 1220101969. The next prime is 1220102003. The reversal of 1220101998 is 8991010221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49840 + ... + 70172.

It is an arithmetic number, because the mean of its divisors is an integer number (77869053).

Almost surely, 2^1220101998 is an apocalyptic number.

1220101998 is an abundant number, since it is smaller than the sum of its proper divisors (1271707698).

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

1220101998 is a wasteful number, since it uses less digits than its factorization.

1220101998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20548.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 1220101998 is about 34929.9584597520. The cubic root of 1220101998 is about 1068.5595074326.

The spelling of 1220101998 in words is "one billion, two hundred twenty million, one hundred one thousand, nine hundred ninety-eight".