1221422040 has 96 divisors (see below), whose sum is σ = 3979544400. Its totient is φ = 324898560.

The previous prime is 1221422003. The next prime is 1221422053. The reversal of 1221422040 is 402241221.

1221422040 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

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, 147531 + ... + 155589.

Almost surely, 2^1221422040 is an apocalyptic number.

1221422040 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 1221422040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1989772200).

1221422040 is an abundant number, since it is smaller than the sum of its proper divisors (2758122360).

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

1221422040 is a wasteful number, since it uses less digits than its factorization.

1221422040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8497 (or 8490 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1221422040 is about 34948.8489080828. The cubic root of 1221422040 is about 1068.9447307016.

Adding to 1221422040 its reverse (402241221), we get a palindrome (1623663261).

The spelling of 1221422040 in words is "one billion, two hundred twenty-one million, four hundred twenty-two thousand, forty".