1201942721 has 16 divisors (see below), whose sum is σ = 1461375360. Its totient is φ = 965018880.

The previous prime is 1201942691. The next prime is 1201942733. The reversal of 1201942721 is 1272491021.

It is not a de Polignac number, because 1201942721 - 2²² = 1197748417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201942121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1175 + ... + 49043.

It is an arithmetic number, because the mean of its divisors is an integer number (91335960).

Almost surely, 2^1201942721 is an apocalyptic number.

It is an amenable number.

1201942721 is a deficient number, since it is larger than the sum of its proper divisors (259432639).

1201942721 is a wasteful number, since it uses less digits than its factorization.

1201942721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48104.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1201942721 is about 34669.0455738257. The cubic root of 1201942721 is about 1063.2317180854.

The spelling of 1201942721 in words is "one billion, two hundred one million, nine hundred forty-two thousand, seven hundred twenty-one".