1221111402 has 32 divisors (see below), whose sum is σ = 2792620032. Its totient is φ = 348700464.

The previous prime is 1221111373. The next prime is 1221111427. The reversal of 1221111402 is 2041111221.

It is a super-2 number, since 2×1221111402² = 2982226112188811208, which contains 22 as substring.

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, 83223 + ... + 96789.

It is an arithmetic number, because the mean of its divisors is an integer number (87269376).

Almost surely, 2^1221111402 is an apocalyptic number.

1221111402 is an abundant number, since it is smaller than the sum of its proper divisors (1571508630).

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

1221111402 is a wasteful number, since it uses less digits than its factorization.

1221111402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15722.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1221111402 is about 34944.4044447748. The cubic root of 1221111402 is about 1068.8541032754.

Adding to 1221111402 its reverse (2041111221), we get a palindrome (3262222623).

The spelling of 1221111402 in words is "one billion, two hundred twenty-one million, one hundred eleven thousand, four hundred two".