21221240120407 has 2 divisors, whose sum is σ = 21221240120408. Its totient is φ = 21221240120406.

The previous prime is 21221240120371. The next prime is 21221240120441. The reversal of 21221240120407 is 70402104212212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221240120407 - 2⁷ = 21221240120279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221240120207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610620060203 + 10610620060204.

It is an arithmetic number, because the mean of its divisors is an integer number (10610620060204).

Almost surely, 2^{21221240120407} is an apocalyptic number.

21221240120407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221240120407 is an equidigital number, since it uses as much as digits as its factorization.

21221240120407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 28.

Adding to 21221240120407 its reverse (70402104212212), we get a palindrome (91623344332619).

The spelling of 21221240120407 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred forty million, one hundred twenty thousand, four hundred seven".