1211020002 has 24 divisors (see below), whose sum is σ = 2673385884. Its totient is φ = 396056544.

The previous prime is 1211019919. The next prime is 1211020021. The reversal of 1211020002 is 2000201121.

It can be written as a sum of positive squares in 2 ways, for example, as 1208327121 + 2692881 = 34761^2 + 1641^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 633753 + ... + 635660.

Almost surely, 2^1211020002 is an apocalyptic number.

1211020002 is an abundant number, since it is smaller than the sum of its proper divisors (1462365882).

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

1211020002 is a wasteful number, since it uses less digits than its factorization.

1211020002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269474 (or 1269471 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1211020002 is about 34799.7126712276. The cubic root of 1211020002 is about 1065.9015786786.

Adding to 1211020002 its reverse (2000201121), we get a palindrome (3211221123).

The spelling of 1211020002 in words is "one billion, two hundred eleven million, twenty thousand, two".