1221025102 has 16 divisors (see below), whose sum is σ = 2115573552. Its totient is φ = 522363520.

The previous prime is 1221025031. The next prime is 1221025111. The reversal of 1221025102 is 2015201221.

It is a happy number.

It is a super-2 number, since 2×1221025102² = 2981804599428220808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632013 + ... + 1632760.

It is an arithmetic number, because the mean of its divisors is an integer number (132223347).

Almost surely, 2^1221025102 is an apocalyptic number.

1221025102 is a deficient number, since it is larger than the sum of its proper divisors (894548450).

1221025102 is a wasteful number, since it uses less digits than its factorization.

1221025102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264803.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1221025102 is about 34943.1696043733. The cubic root of 1221025102 is about 1068.8289228586.

Adding to 1221025102 its reverse (2015201221), we get a palindrome (3236226323).

The spelling of 1221025102 in words is "one billion, two hundred twenty-one million, twenty-five thousand, one hundred two".