1221401522 has 32 divisors (see below), whose sum is σ = 2088388224. Its totient is φ = 530323200.

The previous prime is 1221401473. The next prime is 1221401527. The reversal of 1221401522 is 2251041221.

It is a junction number, because it is equal to n+sod(n) for n = 1221401494 and 1221401503.

It is not an unprimeable number, because it can be changed into a prime (1221401527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 564122 + ... + 566282.

It is an arithmetic number, because the mean of its divisors is an integer number (65262132).

Almost surely, 2^1221401522 is an apocalyptic number.

1221401522 is a deficient number, since it is larger than the sum of its proper divisors (866986702).

1221401522 is a wasteful number, since it uses less digits than its factorization.

1221401522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1221401522 is about 34948.5553635626. Note that the first 3 decimals coincide. The cubic root of 1221401522 is about 1068.9387451290.

Adding to 1221401522 its reverse (2251041221), we get a palindrome (3472442743).

The spelling of 1221401522 in words is "one billion, two hundred twenty-one million, four hundred one thousand, five hundred twenty-two".