21272277078 has 48 divisors (see below), whose sum is σ = 51187749840. Its totient is φ = 6545313216.

The previous prime is 21272277067. The next prime is 21272277101. The reversal of 21272277078 is 87077227212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1156351 + ... + 1174602.

It is an arithmetic number, because the mean of its divisors is an integer number (1066411455).

Almost surely, 2^21272277078 is an apocalyptic number.

21272277078 is an abundant number, since it is smaller than the sum of its proper divisors (29915472762).

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

21272277078 is a wasteful number, since it uses less digits than its factorization.

21272277078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330990 (or 2330971 counting only the distinct ones).

The product of its (nonzero) digits is 307328, while the sum is 45.

The spelling of 21272277078 in words is "twenty-one billion, two hundred seventy-two million, two hundred seventy-seven thousand, seventy-eight".