21220040061407 has 16 divisors (see below), whose sum is σ = 24567718224384. Its totient is φ = 18114058224000.

The previous prime is 21220040061343. The next prime is 21220040061427. The reversal of 21220040061407 is 70416004002212.

It is a cyclic number.

It is not a de Polignac number, because 21220040061407 - 2⁶ = 21220040061343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220040061407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220040061427) 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, 131562269 + ... + 131723462.

It is an arithmetic number, because the mean of its divisors is an integer number (1535482389024).

Almost surely, 2^{21220040061407} is an apocalyptic number.

21220040061407 is a deficient number, since it is larger than the sum of its proper divisors (3347678162977).

21220040061407 is a wasteful number, since it uses less digits than its factorization.

21220040061407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263286190.

The product of its (nonzero) digits is 5376, while the sum is 29.

Adding to 21220040061407 its reverse (70416004002212), we get a palindrome (91636044063619).

The spelling of 21220040061407 in words is "twenty-one trillion, two hundred twenty billion, forty million, sixty-one thousand, four hundred seven".