1221400422002 has 16 divisors (see below), whose sum is σ = 1916172357120. Its totient is φ = 582798946752.

The previous prime is 1221400421977. The next prime is 1221400422007. The reversal of 1221400422002 is 2002240041221.

It is not an unprimeable number, because it can be changed into a prime (1221400422007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30640802 + ... + 30680637.

It is an arithmetic number, because the mean of its divisors is an integer number (119760772320).

Almost surely, 2^{1221400422002} is an apocalyptic number.

1221400422002 is a deficient number, since it is larger than the sum of its proper divisors (694771935118).

1221400422002 is a wasteful number, since it uses less digits than its factorization.

1221400422002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61321897.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 1221400422002 its reverse (2002240041221), we get a palindrome (3223640463223).

The spelling of 1221400422002 in words is "one trillion, two hundred twenty-one billion, four hundred million, four hundred twenty-two thousand, two".