1212198879770 has 16 divisors (see below), whose sum is σ = 2252343725568. Its totient is φ = 469238275920.

The previous prime is 1212198879629. The next prime is 1212198879821. The reversal of 1212198879770 is 779788912121.

It is a super-2 number, since 2×1212198879770² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1955159174 + ... + 1955159793.

It is an arithmetic number, because the mean of its divisors is an integer number (140771482848).

Almost surely, 2^{1212198879770} is an apocalyptic number.

1212198879770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212198879770 is a deficient number, since it is larger than the sum of its proper divisors (1040144845798).

1212198879770 is a wasteful number, since it uses less digits than its factorization.

1212198879770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3910319005.

The product of its (nonzero) digits is 7112448, while the sum is 62.

The spelling of 1212198879770 in words is "one trillion, two hundred twelve billion, one hundred ninety-eight million, eight hundred seventy-nine thousand, seven hundred seventy".