1270742121 has 24 divisors (see below), whose sum is σ = 2069288480. Its totient is φ = 770144760.

The previous prime is 1270742119. The next prime is 1270742147. The reversal of 1270742121 is 1212470721.

It is a happy number.

It is not a de Polignac number, because 1270742121 - 2¹ = 1270742119 is a prime.

It is a super-2 number, since 2×1270742121² = 3229571076167157282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1270742101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191215 + ... + 197748.

Almost surely, 2^1270742121 is an apocalyptic number.

1270742121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1270742121 is a deficient number, since it is larger than the sum of its proper divisors (798546359).

1270742121 is a wasteful number, since it uses less digits than its factorization.

1270742121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388994 (or 388977 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1270742121 is about 35647.4700504818. The cubic root of 1270742121 is about 1083.1430278945.

The spelling of 1270742121 in words is "one billion, two hundred seventy million, seven hundred forty-two thousand, one hundred twenty-one".