2221212402 has 32 divisors (see below), whose sum is σ = 4984911360. Its totient is φ = 733071600.

The previous prime is 2221212361. The next prime is 2221212421. The reversal of 2221212402 is 2042121222.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198178 + ... + 209085.

It is an arithmetic number, because the mean of its divisors is an integer number (155778480).

Almost surely, 2^2221212402 is an apocalyptic number.

2221212402 is an abundant number, since it is smaller than the sum of its proper divisors (2763698958).

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

2221212402 is a wasteful number, since it uses less digits than its factorization.

2221212402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407375 (or 407369 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 2221212402 is about 47129.7401011294. The cubic root of 2221212402 is about 1304.7581848155.

Adding to 2221212402 its reverse (2042121222), we get a palindrome (4263333624).

The spelling of 2221212402 in words is "two billion, two hundred twenty-one million, two hundred twelve thousand, four hundred two".