21221560420629 has 8 divisors (see below), whose sum is σ = 28295632753152. Its totient is φ = 14147597517600.

The previous prime is 21221560420603. The next prime is 21221560420637. The reversal of 21221560420629 is 92602406512212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21221560420629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221560420679) 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, 26903797 + ... + 27681354.

It is an arithmetic number, because the mean of its divisors is an integer number (3536954094144).

Almost surely, 2^{21221560420629} is an apocalyptic number.

It is an amenable number.

21221560420629 is a deficient number, since it is larger than the sum of its proper divisors (7074072332523).

21221560420629 is a wasteful number, since it uses less digits than its factorization.

21221560420629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54714747.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 21221560420629 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred sixty million, four hundred twenty thousand, six hundred twenty-nine".