2077221906 has 24 divisors (see below), whose sum is σ = 4536090624. Its totient is φ = 686954520.

The previous prime is 2077221901. The next prime is 2077221943. The reversal of 2077221906 is 6091227702.

It is not an unprimeable number, because it can be changed into a prime (2077221901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 452050 + ... + 456621.

It is an arithmetic number, because the mean of its divisors is an integer number (189003776).

Almost surely, 2^2077221906 is an apocalyptic number.

2077221906 is an abundant number, since it is smaller than the sum of its proper divisors (2458868718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2077221906 is a wasteful number, since it uses less digits than its factorization.

2077221906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908806 (or 908803 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 2077221906 is about 45576.5499571874. The cubic root of 2077221906 is about 1275.9322989765.

It can be divided in two parts, 207722 and 1906, that added together give a triangular number (209628 = T₆₄₇).

The spelling of 2077221906 in words is "two billion, seventy-seven million, two hundred twenty-one thousand, nine hundred six".