21221240120402 has 16 divisors (see below), whose sum is σ = 38293967135040. Its totient is φ = 8616142605168.

The previous prime is 21221240120371. The next prime is 21221240120407. The reversal of 21221240120402 is 20402104212212.

It is not an unprimeable number, because it can be changed into a prime (21221240120407) 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, 39889548833 + ... + 39889549364.

It is an arithmetic number, because the mean of its divisors is an integer number (2393372945940).

Almost surely, 2^{21221240120402} is an apocalyptic number.

21221240120402 is a deficient number, since it is larger than the sum of its proper divisors (17072727014638).

21221240120402 is a wasteful number, since it uses less digits than its factorization.

21221240120402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79779098225.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21221240120402 its reverse (20402104212212), we get a palindrome (41623344332614).

The spelling of 21221240120402 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred forty million, one hundred twenty thousand, four hundred two".