21220620061 has 8 divisors (see below), whose sum is σ = 21907759104. Its totient is φ = 20533643760.

The previous prime is 21220620017. The next prime is 21220620089. The reversal of 21220620061 is 16002602212.

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

It is a cyclic number.

It is not a de Polignac number, because 21220620061 - 2³³ = 12630685469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220620661) 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, 259620 + ... + 331426.

It is an arithmetic number, because the mean of its divisors is an integer number (2738469888).

Almost surely, 2^21220620061 is an apocalyptic number.

It is an amenable number.

21220620061 is a deficient number, since it is larger than the sum of its proper divisors (687139043).

21220620061 is an equidigital number, since it uses as much as digits as its factorization.

21220620061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81371.

The product of its (nonzero) digits is 576, while the sum is 22.

The spelling of 21220620061 in words is "twenty-one billion, two hundred twenty million, six hundred twenty thousand, sixty-one".