1221754742 has 24 divisors (see below), whose sum is σ = 2101189896. Its totient is φ = 530714496.

The previous prime is 1221754727. The next prime is 1221754823. The reversal of 1221754742 is 2474571221.

It is a super-3 number, since 3×1221754742³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100568 + ... + 112059.

It is an arithmetic number, because the mean of its divisors is an integer number (87549579).

Almost surely, 2^1221754742 is an apocalyptic number.

1221754742 is a deficient number, since it is larger than the sum of its proper divisors (879435154).

1221754742 is a wasteful number, since it uses less digits than its factorization.

1221754742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212672 (or 212659 counting only the distinct ones).

The product of its digits is 31360, while the sum is 35.

The square root of 1221754742 is about 34953.6084260266. The cubic root of 1221754742 is about 1069.0417781736.

The spelling of 1221754742 in words is "one billion, two hundred twenty-one million, seven hundred fifty-four thousand, seven hundred forty-two".