1221141870 has 96 divisors (see below), whose sum is σ = 3426040800. Its totient is φ = 299987712.

The previous prime is 1221141869. The next prime is 1221141973. The reversal of 1221141870 is 781411221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 969301 + ... + 970559.

It is an arithmetic number, because the mean of its divisors is an integer number (35687925).

Almost surely, 2^1221141870 is an apocalyptic number.

1221141870 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 1221141870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1713020400).

1221141870 is an abundant number, since it is smaller than the sum of its proper divisors (2204898930).

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

1221141870 is a wasteful number, since it uses less digits than its factorization.

1221141870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114 (or 2111 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1221141870 is about 34944.8403916801. The cubic root of 1221141870 is about 1068.8629928755.

The spelling of 1221141870 in words is "one billion, two hundred twenty-one million, one hundred forty-one thousand, eight hundred seventy".