1212772100 has 18 divisors (see below), whose sum is σ = 2631715674. Its totient is φ = 485108800.

The previous prime is 1212772079. The next prime is 1212772123. The reversal of 1212772100 is 12772121.

It can be written as a sum of positive squares in 3 ways, for example, as 87572164 + 1125199936 = 9358^2 + 33544^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6063761 + ... + 6063960.

Almost surely, 2^1212772100 is an apocalyptic number.

1212772100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212772100 is an abundant number, since it is smaller than the sum of its proper divisors (1418943574).

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

1212772100 is a wasteful number, since it uses less digits than its factorization.

1212772100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12127735 (or 12127728 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 1212772100 is about 34824.8776020821. The cubic root of 1212772100 is about 1066.4153780883.

The spelling of 1212772100 in words is "one billion, two hundred twelve million, seven hundred seventy-two thousand, one hundred".