21421121170 has 32 divisors (see below), whose sum is σ = 41577338880. Its totient is φ = 7919487360.

The previous prime is 21421121149. The next prime is 21421121171. The reversal of 21421121170 is 7112112412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21421121171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1367122 + ... + 1382701.

It is an arithmetic number, because the mean of its divisors is an integer number (1299291840).

Almost surely, 2^21421121170 is an apocalyptic number.

21421121170 is a deficient number, since it is larger than the sum of its proper divisors (20156217710).

21421121170 is a wasteful number, since it uses less digits than its factorization.

21421121170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2749890.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 21421121170 its reverse (7112112412), we get a palindrome (28533233582).

The spelling of 21421121170 in words is "twenty-one billion, four hundred twenty-one million, one hundred twenty-one thousand, one hundred seventy".