213121002 has 32 divisors (see below), whose sum is σ = 432734400. Its totient is φ = 69964928.

The previous prime is 213120979. The next prime is 213121019. The reversal of 213121002 is 200121312.

It is a super-2 number, since 2×213121002² = 90841122986968008, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 168649 + ... + 169907.

It is an arithmetic number, because the mean of its divisors is an integer number (13522950).

Almost surely, 2^213121002 is an apocalyptic number.

213121002 is an abundant number, since it is smaller than the sum of its proper divisors (219613398).

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

213121002 is a wasteful number, since it uses less digits than its factorization.

213121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 213121002 is about 14598.6643909640. The cubic root of 213121002 is about 597.3223290179.

Adding to 213121002 its reverse (200121312), we get a palindrome (413242314).

The spelling of 213121002 in words is "two hundred thirteen million, one hundred twenty-one thousand, two".