921142138 has 32 divisors (see below), whose sum is σ = 1644624000. Its totient is φ = 378579264.

The previous prime is 921142099. The next prime is 921142147. The reversal of 921142138 is 831241129.

It is a super-2 number, since 2×921142138² = 1697005676798422088, 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, 52881 + ... + 68107.

It is an arithmetic number, because the mean of its divisors is an integer number (51394500).

Almost surely, 2^921142138 is an apocalyptic number.

921142138 is a deficient number, since it is larger than the sum of its proper divisors (723481862).

921142138 is a wasteful number, since it uses less digits than its factorization.

921142138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15414.

The product of its digits is 3456, while the sum is 31.

The square root of 921142138 is about 30350.3235238111. The cubic root of 921142138 is about 972.9911346579.

The spelling of 921142138 in words is "nine hundred twenty-one million, one hundred forty-two thousand, one hundred thirty-eight".