20777060221 has 16 divisors (see below), whose sum is σ = 22827961728. Its totient is φ = 18831052800.

The previous prime is 20777060149. The next prime is 20777060233. The reversal of 20777060221 is 12206077702.

It is a cyclic number.

It is not a de Polignac number, because 20777060221 - 2¹³ = 20777052029 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 (20777060251) 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, 148260 + ... + 252061.

It is an arithmetic number, because the mean of its divisors is an integer number (1426747608).

Almost surely, 2^20777060221 is an apocalyptic number.

It is an amenable number.

20777060221 is a deficient number, since it is larger than the sum of its proper divisors (2050901507).

20777060221 is a wasteful number, since it uses less digits than its factorization.

20777060221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400452.

The product of its (nonzero) digits is 16464, while the sum is 34.

The spelling of 20777060221 in words is "twenty billion, seven hundred seventy-seven million, sixty thousand, two hundred twenty-one".