1221020070 has 32 divisors (see below), whose sum is σ = 3102828768. Its totient is φ = 306451968.

The previous prime is 1221020069. The next prime is 1221020077. The reversal of 1221020070 is 700201221.

It is a super-2 number, since 2×1221020070² = 2981780022685609800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221020077) 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, 1196569 + ... + 1197588.

It is an arithmetic number, because the mean of its divisors is an integer number (96963399).

Almost surely, 2^1221020070 is an apocalyptic number.

1221020070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221020070 is an abundant number, since it is smaller than the sum of its proper divisors (1881808698).

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

1221020070 is a wasteful number, since it uses less digits than its factorization.

1221020070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394184.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 1221020070 is about 34943.0976016724. The cubic root of 1221020070 is about 1068.8274545965.

Adding to 1221020070 its reverse (700201221), we get a palindrome (1921221291).

The spelling of 1221020070 in words is "one billion, two hundred twenty-one million, twenty thousand, seventy".