1211222040 has 64 divisors (see below), whose sum is σ = 4152764160. Its totient is φ = 276850560.

The previous prime is 1211222029. The next prime is 1211222087. The reversal of 1211222040 is 402221121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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, 720126 + ... + 721805.

It is an arithmetic number, because the mean of its divisors is an integer number (64886940).

Almost surely, 2^1211222040 is an apocalyptic number.

1211222040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211222040 is an abundant number, since it is smaller than the sum of its proper divisors (2941542120).

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

1211222040 is a wasteful number, since it uses less digits than its factorization.

1211222040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441952 (or 1441948 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1211222040 is about 34802.6154189595. The cubic root of 1211222040 is about 1065.9608512059.

Adding to 1211222040 its reverse (402221121), we get a palindrome (1613443161).

The spelling of 1211222040 in words is "one billion, two hundred eleven million, two hundred twenty-two thousand, forty".